<p>The same thing happened to me after using geany with root. As user i couldn't start geany again, even after reboot :</p>
<p><code>"Geany tried to access the Unix Domain socket of another instance running as another user. This is a fatal error and Geany will now quit."</code></p>
<p>I'm not sure why but I fixed this error with a clean <code>sudo geany</code>, closing the wrindow and reopening geany as normal user.</p>

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