unity inspector failed to load

Mac OS X 10.10.3

Unity 4.6.3f1

Each time I Create a New Untiy Project, the inspector show “Failed to load”(See below)

Why? How to deal with it?
[46628-屏幕快照-2015-05-19-112410.png|46628]

I don’t know if you still have this problem, but all I did to fix it was click the little list tab at the top right of the inspector tab and then add new tab/inspector… And it worked