Ghosting problems in SW

SW started having serious ghosting problems today. If I'mplacing a line or a dimension, for example, the previewline/demension copies itself so many times that I can't see what'sgoing on. If I refresh/zoom in and out it's fine, but it's prettyannoying. It wasn't doing it before. I restarted because, you know,it's the thing to do when stuff is screwing up. But no luck.
Any ideas on what's going on?
thanks,
AllenSolidworksAdministration