I have gone from Tiger to SnoLep and have exactly the same problems cited in a posting on this list dated 2007. The correspondent writes:
"For example, if you draw a single rectangle, circle, polygon or line, all you see are line bits or dots during the click and drag or point-to-point. The object you've drawn wont' be seen until you release the mouse/complete the drawing action.
It appears to be some sort of incompatibility with the drawing engine, perhaps QuickDraw, or the like."
My question: is there a solution to these problems other than an upgrade?
Ptarmigan