Problem is reproduced in following steps:
1.Open/create any assembly (even with 5-6 parts).
2.Open a part from the assembly in separate window.Don't close the assembly window.
3.Edit/create sketch.All sketch functions work normally.Save and close the part window.
4.From assembly window open again the same part in separate window.
5.Edit the sketch from step 3 or create new.
6.Try to create any sketch entity.The troubles appear immediately: no preview, incorrect visualization, jump in CPU usage
That effect exists on all our PCs (4) with different operating systems, different display adapters and different versions of the display driver(either SolidWorks certified or not). Is this a bug, or???
Regards, Anton Nanchev