Slack Blank or White Screen? Reload, Restart or Clear the Cache

A blank, white or black Slack window usually has one of four causes: the app failed to load its content, the local cache is corrupt, the connection is blocked, or the graphics driver is misbehaving. Fix it in this order. Press Cmd+R (Mac) or Ctrl+R (Windows) to reload, or Cmd+Shift+R / Ctrl+Shift+R to force reload. To restart Slack, quit it with Cmd+Q or Ctrl+Q and open it again. If that fails, open Help, Troubleshooting, Clear Cache and Restart; on Windows press Alt if the menu bar is hidden. Then open app.slack.com in a browser: if Slack works there, the problem is the desktop app, not your account or network. For a black or flickering window, use Help, Troubleshooting, Disable Hardware Acceleration and Restart, and as a last step reinstall cleanly.

While the Slack window is blank, the app cannot pass your activity to Slack, so your dot can go grey after 10 minutes.

Fix a blank Slack window, in order

• Reload. Click the Slack window and press Cmd+R or Ctrl+R. If the window stays blank, Cmd+Shift+R or Ctrl+Shift+R is Force Reload.
• Clear Cache and Restart. Help, Troubleshooting, Clear Cache and Restart. Your messages stay on Slack's servers; see how to clear the Slack cache.
• Check the connection. Look at slack-status.com for an incident, then try another network or turn your VPN off and on. Strict proxies and firewalls can block the app.
• Turn off hardware acceleration, then update. Help, Troubleshooting, Disable Hardware Acceleration and Restart makes Slack draw without the graphics card, which gets around a GPU driver that leaves the window white or black. Then update Slack and your graphics driver, and turn acceleration back on from the same menu.
• Reinstall cleanly. Quit Slack, delete its app data folder, and reinstall from slack.com. On a Mac the folder is ~/Library/Application Support/Slack (App Store version: ~/Library/Containers/com.tinyspeck.slackmacgap); on Windows it is %AppData%\Slack. The Mac folders are listed in the next section. You will need to sign in again.

How to restart Slack

Slack has no plain Restart command. These are the ways to restart or reload it, read from the menu code of Slack 4.52.182 for Mac on 2 November 2026 (the Windows app uses the same menus with Ctrl):

What you want	Do this	What it does
Reload the window	View, Reload, or Cmd+R / Ctrl+R	Reloads the workspace without quitting
Force reload	View, Force Reload, or Cmd+Shift+R / Ctrl+Shift+R	A harder reload of the window
Full restart	Quit Slack with Cmd+Q / Ctrl+Q, then open Slack again	Ends every Slack process
Restart with a clean cache	Help, Troubleshooting, Clear Cache and Restart	Clears the cache and reopens; you stay signed in
Restart without the graphics card	Help, Troubleshooting, Disable Hardware Acceleration and Restart	For white, black or flickering windows

On Windows, closing the window with the X does not quit Slack. Its setting runFromTray is on by default, and the app explains it with the message "Slack’s set to stay running in the notification area. To change this, visit Preferences > Advanced." Quit from the tray icon or with Ctrl+Q. In the Mac App Store version the cache item reads Clear Cache and Exit, so open Slack again yourself afterwards.

This is the Troubleshooting menu as Slack 4.52.182 builds it. We pulled the code out of /Applications/Slack.app/Contents/Resources/app.asar and shortened it to the labels:

label: 'Troubleshooting', submenu: [
  { label: '&Report Issue…' },
  { label: useHwAcceleration ? 'Disable Hardware Acceleration and Restart'
                             : 'Enable Hardware Acceleration and Restart' },
  { label: 'Show &Logs in Finder' },
  ...netLog,      // 'Restart and Collect Netlogs…' where supported
  ...debugLogs,   // 'Restart and Collect Verbose Debug Logs…' on some builds
  { label: 'Copy Installation ID' },
  { label: process.mas ? '&Clear Cache and Exit' : '&Clear Cache and Restart' },
  { label: 'Reset &App Data…' },
]

Reset App Data… is the bigger step after Clear Cache: it resets the app's local data, and the … means Slack asks before it acts. Try it before a full reinstall.

What a blank Slack window usually means

What you see	Likely cause	Try
White window, menu works	Content failed to load	Reload, then clear cache
Blank after an update	Corrupt cache	Clear Cache and Restart
Blank on VPN or office Wi-Fi	Blocked connection	Browser test, another network
Black or flickering window	Graphics driver or GPU	Update the driver
Blank on every launch	Broken install	Clean reinstall

Where Slack keeps its files on a Mac (com.tinyspeck.slackmacgap)

com.tinyspeck.slackmacgap is the bundle ID of Slack for Mac, and it names Slack's cache, updater and settings files. It is the same for the version downloaded from slack.com and the App Store version. We checked the downloaded Slack 4.52.171 on macOS 26.5.2 on 7 October 2026:

mdls -name kMDItemCFBundleIdentifier /Applications/Slack.app
ls ~/Library/Caches | grep tinyspeck
ls ~/Library/Preferences | grep tinyspeck
du -sh ~/Library/Application\ Support/Slack

kMDItemCFBundleIdentifier = "com.tinyspeck.slackmacgap"
com.tinyspeck.slackmacgap
com.tinyspeck.slackmacgap.ShipIt
com.tinyspeck.slackmacgap.plist
1.3G	/Users/sieunpark/Library/Application Support/Slack

Path	What it holds	Safe to delete when Slack is blank?
~/Library/Application Support/Slack	The app's cache, local storage, service worker and logs (1.3 GB on our Mac)	Yes, with Slack quit. You sign in again
~/Library/Caches/com.tinyspeck.slackmacgap	A small network cache (404 KB)	Yes
~/Library/Caches/com.tinyspeck.slackmacgap.ShipIt	The auto-updater, ShipIt: its log, state and a downloaded update (323 MB)	Yes; the next update downloads again
~/Library/Preferences/com.tinyspeck.slackmacgap.plist	App settings such as window position	Only for a fully clean reinstall
~/Library/Containers/com.tinyspeck.slackmacgap	App Store version only; not present with the downloaded app	Yes, for the App Store version

Deleting these removes nothing from your workspace. Messages and files stay on Slack's servers. Help, Troubleshooting, Clear Cache and Restart clears the cache part of the first folder without the sign-in.

Slack white screen on Windows 11

• Press Alt to show the menu if the window is fully white, then use Help, Troubleshooting.

• Update the graphics driver from your PC maker or GPU vendor.

• If you installed Slack from the Microsoft Store, try the version from slack.com instead, or the reverse.

• Check that a VPN or security tool is not blocking Slack.

Slack blank screen on Mac

• Use Help in the menu bar, then Troubleshooting, Clear Cache and Restart.

• Update macOS and Slack.

• If you have both the App Store and the downloaded version, delete one.

• Clean reinstall with the folder paths above if it still fails.

Slack app not loading at all

If the app does not open or closes at once, restart the computer, then reinstall. If Slack loads in the browser but not in the app, use the browser while you fix the app; see Slack desktop app vs browser. If everyone looks offline once it loads, see Slack showing everyone offline. If Slack is slow rather than blank, see why Slack uses so much memory. If messages load but images stay blank, the cause is usually a setting such as Inline media or /collapse; see Slack images not showing. If nothing here works, see how to contact Slack support.

If Slack opens and then closes by itself, rather than showing a blank window, the fixes are in Slack keeps crashing.

If no window appears at all, Slack is often still running in the background or its window is on a disconnected monitor; see Slack app not opening.

FAQ

Why is my Slack desktop app blank?

Usually a failed load or a corrupt cache. Reload with Cmd or Ctrl+R, then Clear Cache and Restart.

How do I restart Slack?

Quit it with Cmd+Q on a Mac or Ctrl+Q on Windows, then open it again. Closing the window is not enough on Windows, because Slack keeps running in the tray.

Will reinstalling Slack delete my messages?

No. Messages stay on Slack's servers. You only need to sign in again.

Slack works in the browser but not the app. Why?

The desktop app's local files or install are broken. Clear the cache or reinstall cleanly.