OS: Ubuntu 13.04

desktop environment : unity

Process : Intel® Core™2 Quad CPU Q9550 @ 2.83GHz × 4

Ram : 4GB

Video card : ATI 1GB

i use "unity tweak tool" to change icons, and when i change icons to "Faenza", and try to search in unity i see some icons disappeared and the all unity freezing except mouse still i can move it.

and i try to use another "Flattr" sets but same problem

http://deviantn7k1.deviantart.com/art/Flattr-icon-theme-376383397

and then try to play with "Inherits" in "index.theme" for "Faenza" to depends on Ubuntu mono icons but same problem

and even re-install Ubuntu 13.04 but problem still

and when try to change to "Nitrux" all icons appear and no freezing, and also Ubuntu icons work well.

may be the problem after update the system, or bug