Troubleshooting
“A Slack app is running”
Quit every Slack copy, including test copies. Klack checks for the Slack process before install and uninstall operations.
The modified app does not launch
If you passed --no-resign on macOS, the bundle needs a valid signature before it can launch. Re-run installation without that option or restore Slack.
Browser sign-in opens another Slack copy
macOS chooses a slack:// handler by bundle identifier, not app path. Quit all other Slack copies during sign-in or use the canonical /Applications/Slack.app.
A plugin edit does not apply
Open DevTools and inspect the console for a compile error. Klack intentionally keeps the last working plugin set active when a new source file fails to bundle.
Slack updated and Klack disappeared
Slack updates replace application resources. Re-run the release download if you want to update Klack too, quit Slack, and run klack install again.