**System Information**
Operating system and graphics card
win 8 , gtx 580
win7 quadro 600
win7 gtx 770
**Blender Version**
Broken: (example: 2.74 RC2 )
Worked: (optional)
**Short description of error**
I showed this thing in gif.
{F155625}
when in edit mode and I move or rotate the vertices, the color of the objects will change to something like RGB 0.360 . but when I remove material from one of them everithing is good.
This happens when the 'material tab' is selected
In all other tabs color is changing instantly after presing TAB key
**Exact steps for others to reproduce the error**
Based on a (as simple as possible) attached .blend file with minimum amount of steps
make cube, assign material, copy cube few times, enter edit mode in one of them, try to move one vertex