Comment 2 for bug 1075263

The cause of this is a five-second timeout in indicator-appmenu before it removes closed windows from its internal hash table. When an application restarts within these five seconds and X assigns the app's window the same xid, indicator-appmenu doesn't recognize it as a newly started application. It still shows the menus from the old instance (it has the menu model cashed), but action activations aren't send to the new instance.

The five-second timeout was added due to bamf bug #718926. This has been fixed since then, thus the timeout can be removed (see attached branch).