Sorry for reviving a really old thread, however this worked for me. I had the same problem with several viewers (exodus, phoenix, and even LL's viewer). I would double click the icon, and nothing would happen. I turned off TeamViewer (from the system tray, right click icon and exit) and VOILA - my viewers now load without problems.
Hopefully this helps someone else and thanks to the OP for helping me solve this frustrating issue!