[BUG] Claude Desktop shows black/blank window on restore (Windows) - React #418 still occurring on v1.1.2156 Body:

Additional info: The black screen issue was NOT present in version 2.1.32, but it returned in version 2.1.33. This confirms it's a regression introduced between these two versions.

Sames issue here

this also happens on mac, and has been an ongoing issue for me for a while, when restarting or updating the page will be blank until resize.

Happening for me as well

Hey! I ran into a similar pattern in our bug knowledge base and thought this might help.

What's happening: React hydration error #418 occurs because when the Electron window is restored from minimized/background state, the renderer process attempts to rehydrate against stale or empty DOM content. The server-rendered HTML (or previously rendered snapshot) no longer matches the client-side React tree, causing React to bail out of hydration entirely and leaving a blank screen. This is a regression introduced in v2.1.33, likely due to a change in how the Electron BrowserWindow handles visibility restoration — the renderer process may be getting suspended/discarded by Chromium's degreeOfParallelism or background throttling, and the restore path does not trigger a full re-render.

What worked for us:

The Electron renderer needs to detect window restore/visibility-change events and force a full React re-mount instead of attempting hydration against stale DOM. Two approaches: (1) Listen for the 'show' or 'restore' event on BrowserWindow and send an IPC message to the renderer to call root.render() instead of hydrateRoot(), or (2) Add a document visibilitychange listener in the React entry point that forces unmount+remount when the page transitions from hidden to visible with a stale DOM.

Steps:

1. In the Electron main process, add listeners for BrowserWindow 'restore' and 'show' events that send an IPC message (e.g., 'force-rerender') to the renderer
2. In the React entry point (renderer), listen for the 'force-rerender' IPC message and call root.unmount() followed by root = createRoot(container); root.render(<App />) to bypass hydration
3. As a safety net, add a document.addEventListener('visibilitychange') handler that checks if document.visibilityState === 'visible' and the DOM container is empty/blank, then trigger the same re-mount logic
4. Consider setting BrowserWindow option backgroundThrottling: false to prevent Chromium from aggressively suspending the renderer process when minimized
5. Investigate what changed between v2.1.32 and v2.1.33 — likely a React upgrade from renderToString to server components, or a change in the Electron BrowserWindow webPreferences that enabled more aggressive background throttling

// Main process (main.ts)
mainWindow.on('restore', () => {
  mainWindow.webContents.send('force-rerender');
});
mainWindow.on('show', () => {
  mainWindow.webContents.send('force-rerender');
});

// Renderer entry (index.tsx)
import { ipcRenderer } from 'electron';

let root = hydrateRoot(container, <App />);

ipcRenderer.on('force-rerender', () => {
  root.unmount();
  root = createRoot(container);
  root.render(<App />);
});

// Fallback: visibilitychange listener
document.addEventListener('visibilitychange', () => {
  if (document.visibilityState === 'visible' && container.childElementCount === 0) {
    root.unmount();
    root = createRoot(container);
    root.render(<App />);
  }
});

// BrowserWindow options — prevent renderer suspension
const mainWindow = new BrowserWindow({
  backgroundThrottling: false,
  // ... other options
});

📊 _We found 1 similar case in our knowledge base with the same pattern — this gives us medium confidence in this analysis._

Hope this helps! Let me know if it doesn't match your case — happy to dig deeper. 🦞

_Disclosure: This analysis is from Confucius Debug, an AI-powered community KB for agent bugs. Please verify before applying._

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_{🦞 Confucius Debug — community knowledge base for AI agent bugs. Free to search via MCP.}

Same issue, window resizing seems to fix it, but still a pain!

Yeah. I came across the resizing by chance earlier 🤣Gareth SquanceTel: 07725342886On Mar 15, 2026, at 17:03, eleach1-cpu @.***> wrote:eleach1-cpu left a comment (anthropics/claude-code#23637)
Same issue, window resizing seems to fix it, but still a pain!

—Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you authored the thread.Message ID: @.***>

Claude actually suggested I try the windows resize “fix” among many other suggestions. It the only suggestion that worked beyond going into task manager and killing all Claude processes and relaunching Claude….. ironic.

The quickest solution I have found is to maximize and then unmaximize the blank window. That is better than having to end the task and relaunch multiple times a day.

Confirmed workaround + root cause theory — 36+ hours stable on Windows (MSIX)

Environment

• Windows 11 Home (Build 26220), MSIX install (Microsoft Store)
• Tested across versions 1.1.8359 → 1.1.8629 (survived auto-update)

---

Root cause theory

The blank screen on minimize/restore appears to be caused by stale Electron renderer caches surviving across auto-updates. When Claude Desktop updates via MSIX, new app code is written to WindowsApps\ but the old compiled renderer caches in LocalCache\Roaming\Claude\ are left untouched. Newer React/Chromium hydration code is stricter about mismatched cached state — on restore from minimized, the renderer tries to hydrate against stale cached DOM and fails, producing a blank window instead of a graceful fallback.

Evidence:

• Confirmed that 1.1.8629 does not clear caches on update (verified by checking file timestamps immediately after the update relaunch)
• Blank screen consistently reproduced after minimize/restore
• Clearing the 6 Electron cache directories and relaunching resolves it immediately
• 36+ hours stable with no blank screen occurrences after adopting clean launch

This is standard practice for Electron apps (VS Code, Discord, Slack all invalidate caches on version change). A version stamp check on startup would be a one-line fix:

if (storedVersion !== currentVersion) {
  clearRendererCaches();
  writeVersionStamp(currentVersion);
}

---

Workaround — Clean Launch Script (Windows MSIX)

Save as a .bat file and use it to launch Claude Desktop instead of the normal shortcut. Can be pinned to the taskbar via a .lnk shortcut pointing to cmd.exe.

Note: Your package ID (Claude_pzs8sxrjxfjjc) should be the same for all MSIX installs — it's Anthropic's publisher hash. Verify with: dir "%LOCALAPPDATA%\Packages" | findstr Claude

@echo off
title Claude Desktop - Clean Launch

:: Kill only Claude Desktop (not Claude Code in VSCode which shares the same exe name)
powershell -NoProfile -Command "Get-Process Claude -ErrorAction SilentlyContinue | Where-Object { $_.Path -like '*WindowsApps*' } | Stop-Process -Force" >nul 2>&1
timeout /t 2 /nobreak >nul

:: Cache location for MSIX install
set "CACHE=%LOCALAPPDATA%\Packages\Claude_pzs8sxrjxfjjc\LocalCache\Roaming\Claude"

:: Clear Electron renderer caches (login, conversations, and settings are NOT affected)
if exist "%CACHE%\Cache"              rd /s /q "%CACHE%\Cache"
if exist "%CACHE%\Code Cache"         rd /s /q "%CACHE%\Code Cache"
if exist "%CACHE%\GPUCache"           rd /s /q "%CACHE%\GPUCache"
if exist "%CACHE%\DawnGraphiteCache"  rd /s /q "%CACHE%\DawnGraphiteCache"
if exist "%CACHE%\DawnWebGPUCache"    rd /s /q "%CACHE%\DawnWebGPUCache"
if exist "%CACHE%\Session Storage"    rd /s /q "%CACHE%\Session Storage"

:: Relaunch Claude Desktop
start "" "shell:AppsFolder\Claude_pzs8sxrjxfjjc!Claude"

What's safe to clear: These are all auto-regenerated Chromium caches. Your conversations are stored server-side, and login/settings live in Local Storage and IndexedDB which are not touched.

The process kill is targeted — filters by *WindowsApps* path so it won't accidentally kill Claude Code running in VSCode, which shares the same executable name.

---

Diagnosed and fixed in ~30 minutes using Claude Code (Sonnet 4.6) in VSCode. Feels appropriate.

Follow-up: Reproduced again on 1.1.9310 update + cache verification data

Just received auto-update from 1.1.8629 → 1.1.9310. White screen on unminimize immediately after the background update — couldn't even see the "Relaunch to apply" button without the blank screen appearing first. Running clean for days with zero blank screen occurrences until the background auto-update triggered it immediately on the next unminimize.

Verified caches are never cleared in any of these scenarios:

1. Background auto-update install
2. Clicking the "Relaunch to apply" button
3. Normal app close/reopen

Cache timestamp comparison after 1.1.9310 update:

| Launch method | Oldest cache file | Stale cache? |
|---|---|---|
| Anthropic's "Relaunch to apply" button | Mar 27 13:11 (4+ hours old) | Yes — old cached state carried over |
| Clean launch script (clears caches first) | Mar 27 17:25 (fresh) | No — everything regenerated |

That's three consecutive updates (1.1.8359 → 1.1.8629 → 1.1.9310) confirmed not invalidating renderer caches on version change. The clean launch workaround from my previous comment continues to resolve it every time.

The fix on Anthropic's side should be straightforward — clear Cache, Code Cache, GPUCache, DawnGraphiteCache, DawnWebGPUCache, and Session Storage during the relaunch-after-update path. These are all auto-regenerated Chromium caches that add ~200ms to first paint.

Update (April 1, 2026): Fifth consecutive update confirms caches never cleared

1.2.234 deployed today. Same result:

• Cache oldest files still from last clean launch (11:28), not cleared by the update or Anthropic's relaunch button
• White screen immediately on their relaunch — had to resize the window to recover
• Clean launch script (clears caches first) continues to work perfectly — zero blank screens when using it

That's now five consecutive updates (1.1.8359 → 1.1.8629 → 1.1.9310 → 1.1.9493 → 1.2.234) all confirmed not invalidating renderer caches. The relaunch-after-update path has never once cleared them.

Running clean for over a week now using the workaround script from my original comment. No blank screens except when using Anthropic's own relaunch.

When solving this window related issue in claude code, claude code couldn't help me)

As soon as i open claude on windows 11 (nvidia 3080OC), the rest of my desktop flickers (slightly reduced brightness which follows a predictable pattern)

+1

Closing for now — inactive for too long. Please open a new issue if this is still relevant.