I have a Microsoft wireless mouse. It has a scroll wheel, however after experimenting with it today, clicking the scroll wheel does not get interpreted as Mouse-3.
Also running the game on low, does alleviate the freeze screens somewhat. I was able to play smoothly for 2 hours last night before it froze. I got about 30 minutes today before it happened again.
Thanks for replying.
Edit: I have updated my graphics driver to the latest drivers to see if it's had an effect. I'm still having frequent screen freezing. Is this normal in longer games? I'm past 400 turns and after playing for a few minutes the screen freezes. I have to kill through task manager and then relaunch. I'll be ok for a few minutes and then it'll freeze again. The game seems to be moving, it's just that the screen is not being rendered.