It does seem mostly to be when I go back to NoMachine from the windows 7 machine. I use Dexpot as a window manager on my Windows machine and desktop 5 (usually using <ALT> 5 to get to the desktop). When I get to the desktop with NoMachine on it, I usually have some problem finding a tag in emacs. Find-tag in emacs is setup as <ALT>-. Thus I typically get the . character inserted. After I undo the ., it works fine again.