Comment 4 for bug 1168738

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Michael Blennerhassett (mjblenner) wrote :

I far as I can tell, this is caused by ~/.config/unity-tweak-tool/pid.lockfile not being deleted on exit. After a while the pid in that file can be another random process, and trying to connect to it on startup as a unity-tweak-tool process will crash.

Workaround is to manually delete ~/.config/unity-tweak-tool/pid.lockfile when this happens