The "Open in same instance" works perfectly.
But when SMplayer is in systray, it opens multiple instances.
It would be interesting for users to open in only one instance everytime, independently if in systray or not.
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I'm afraid I can't reproduce this problem (version svn r919, linux). If the option "Use only one running instance of SMPlayer" is enabled, only one instance is used, no matter if the system tray is enabled or not.