The same happens to me, can't import dwg. (importer not found) and the palettes don't work as expected when you collapse them. Can somebody please help?
thank you !!

In my case (SU 8 PRO& Mavericks) I can't import DWG files. A dialog appears saying: Alert, importer not found. Also I noticed that the Palettes don't work as expected. Very sad don't know what to do ?