Slack launches but the window is completely blank, white or black? This is a rendering or cache problem, not a corrupt install — and it is fixable in a few steps.
Slack draws its interface using hardware GPU acceleration and a local cache. When the graphics driver is outdated, a GPU setting is incompatible with acceleration, or the cached interface data becomes corrupted, the window can open but fail to render anything — leaving a blank panel.
Fully quit Slack from the system tray, then clear its local cache — either with the in-app "clear cache and restart" option or by removing the cache folder while Slack is closed. Your messages return from the cloud on next sign-in.
Install the latest driver for your GPU (NVIDIA, AMD or Intel). This resolves many blank-screen cases on its own. Restart your computer afterwards.
In Slack settings, turn off hardware acceleration, then restart Slack. This forces software rendering, which works on virtually any hardware.
Exit Slack from the system tray and end any Slack processes in Task Manager, then relaunch. A clean restart clears a one-off rendering glitch.
If the screen is still blank, reinstall Slack from the official site. Your messages and workspaces are tied to your account in the cloud, so a clean reinstall does not lose your data.
A blank white or black Slack window is usually a rendering or cache problem. Slack uses hardware GPU acceleration, and an outdated driver, an incompatible GPU setting or a corrupted local cache can leave the interface unable to draw. Clearing the cache or updating the driver usually fixes it.
Fully quit Slack from the system tray, then use the in-app option to clear cache and restart, or remove the local cache folder while Slack is closed. Your messages are restored from the cloud when you sign back in, so nothing important is lost.
Yes. If the window stays blank, disabling hardware/GPU acceleration in Slack forces software rendering, which works on virtually any hardware. Updating your graphics driver is the other reliable fix.
Grab a fresh official copy if the fixes above don't resolve it.