I had this problem a few weeks ago. I did some disk maintenance and repair and the problem went away, although I don’t recall if that was the fix or not. The problem has returned. I have done the disk thing again, also did a reboot and finally a reinstallation of sketchup and the problem remains. version 14 works ok.
reseting your workspace in SU should work…
SketchUp [menu] >> Preferences >> Workspace >> Reset Workspace
here’s a pic…
Thanks John, that worked! I hope I can remember this next time.