Seems a little odd but. The cursor seems to freeze on whatever background it's hovering over. So theres a square of random terrain beneath the arrow symbol at all times. Is this a Windows 7 problem or something else?
I'm currently running arcanum on win7 and I have no such problem. If its a persistent problem there must be a cause I can't even make a guess atm.
Have you applied the unofficial patch? I couldn't get arcanum to even start without it on win7.