I'm currently running Ubuntu Gnome 14.04 and I also installed Maximus because I greatly value every square inch of window space (I'm greedy like that). My issue is anytime a window is maximized (whether a new window opens maximized, or if I maximize it myself), the system doesn't load it properly so I have to press alt+f2, type in r, hit enter (shell reload) and it fixes it. While this works, it's annoying and I'd really like to have it fixed.
The settings I have, if this helps, were edited in gconf-editor. I have no_maximize set to true, and undecorate set to true. It makes no difference if I change no_maximize back to false.