Screen Shot 2013-04-11 at 4.45.12 PM.jpgYes OS X, and mine simply doesn't have it, regardless of how much I mouse over anything..! The only time there's a fullscreen toggle button is on launch where you can select recent projects. But toggling that just turns that window into fullscreen.
I'm having the same problem. Architect is not actually in full screen mode, but it thinks it is. Because of this I cannot change the size of the window or move the window around the screen. Even the mac shortcut to toggle fullscreen will not work. I've tried restarting architect, and restarting my Mac but nothing is working.
I believed this issue was caused when I had architect open in fullscreen mode then I shutdown my Mac without closing architect. A message came up saying that architect prevented the computer from shutting down but then I clicked the dialog telling to computer to shut down anyways. So I'm guessing that when architect was force closed by the OS while in fullscreen mode it caused this issue.