I've been running into a problem ever since we've gotten SW11 (32bit XP). Occacionally when I'm working back and forth between a model and it's drawings I will go in and try to edit one of the sketches in the model. It will act like it' s going to let me edit the sketch, but it does not show the sketch. So I exit out of Edit Sketch and try it again and this time it works. But once I go back to the drawing it tells me that it's still in a rollback state and the drawing is inaccessable. I've tried re-editing the sketch. I 've tried rebuilding the model. I've tried closing the model. It doesn't help and it won't let me close the drawing. I end up saving everything else that I'm working and and then ending Solidworks with task manager. It doesn't happen all of the time and it seems to be able to happen with any model. I was hoping service packs 1 or 2 would help, but they've made no difference. Any ideas?