Whenever I change the "Maximize window" hotkey in Xfwm4 ( via Settings -> Keyboard), I can use that hotkey to maximize my windows, until I restart my computer.
The next time I go to the settings manager, the hotkey will still read "Shift+Alt+M", but pressing those keys won't work, unless I set it again. Needless to say: this is annoying.
If I'm missing any useful information, tell me what to look for and I'll do my best to find it.
OS: Xubuntu 14.04 trusty WM: Xfwm4