I (also) have the problem that only half the toolbar is displayed. The same within the top menu.
http://dl.dropbox.com/u/2399172/bezier1.png
http://dl.dropbox.com/u/2399172/bezier2.png
It was working fine the first few days after adding the plugin bundle. But today it was like this. I tried disable/enable, uninstall/install (with starting SketchUp in between), updated to the lastest version 3b. Same problem in SketchUp 6 and 7.
I really need the Cubic Curve tool for tracing a complicated bent line for work with a tight deadline. Anybody knows what to do?