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.
I am trying to be aware of what keys I am using. Once I fix the problem because the <alt> key is not recognized, it works the right way. I am wondering if there is a focus issue. I am going to continue to try to isolate the pattern that works and not works so that maybe I can figure out where the problem is coming from.