<p>'Geany' no longer detects if there is an instance of itself already running, thus  multiple instances are starting up, instead of files being opened in the current instance.</p>

<p>I doubt it is a "#ifdef HAVE_SOCKET" not being defined since the mutexs (called mutants in win32) are being created with the name 'Geany'.</p>

<p>I suspect it had to do with recent cleanups and changes in <a href="https://github.com/geany/geany/commits/c5b0fc459a1251c824a44edb5dfab4a8feb0bd00/src/socket.c">https://github.com/geany/geany/commits/c5b0fc459a1251c824a44edb5dfab4a8feb0bd00/src/socket.c</a></p>

<p><a href="https://cloud.githubusercontent.com/assets/2829875/9657992/dba0fd70-5213-11e5-9fcd-2c270304dfb7.png" target="_blank"><img src="https://cloud.githubusercontent.com/assets/2829875/9657992/dba0fd70-5213-11e5-9fcd-2c270304dfb7.png" alt="screenshot_of_mutants" style="max-width:100%;"></a></p>

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