All of the models that I've have put up in free stuff were created using Carrara 1.1... and, probably, 95% of those models were done using the spline modeller. The only time I've ever gotten the 'unknown error' pop-up is when I've done some modelling, closed the modelling window, switched back to the assembly room, then tried to go back to the modelling room (either by clicking the modelling room icon or double-clicking the object). If I leave that modelling window open when switching rooms then I usually have no problems. I tend to stay out of the vertex modeller unless I absolutely have to... subdividing some models has produced some very strange results... on the whole, though, I love Carrara. The interface and workflow just seem more natural to me... and I have yet to produce a worthwhile model with any other program (not through lack of trying). BTW... just ordered my upgrade from 1.1 to 3... couldn't afford 2 last year... but after playing with the demo, I just couldn't pass this one up. Wife's gonna be upset when she finds out... FedEx says I've got until 10/7 to break it to her...can't wait :D