Something that came up recently, and has been reported a few times now, is where you get this error message when searching for something in the Components panel:
The natural thing to look at is web cache, but that didn’t help. Fortunately I spotted what was significant. This search would give the error:
and this would not:
36 inch Cabinet
It seems the 3D Warehouse search does not like quote marks. I have alerted the authorities, and hopefully something can be done to fix the problem.