OS X el capitan , Unity 4.6.3 can't build iOS project

Yesterday, i update my iMac system - Os x el captan.Then i found i can’t build iOS project (but other project is work ).

Details: new a hello world project , File - Build Setting - choose iOS - build - choose place - save

then the window which i choose save had gone . Nothings happen . No progress bar , No error tips .Console window is blank.

So , i wanna know what is wrong . the system OS X el capitan ? or something i forgave?

Unity 4.6.9 Released and they have fixed this issue in it.

Download it from here:
https://unity3d.com/get-unity/download/archive