**System Information**
Win 7 64bit. i5, 8gb ram, gtx 960.
**Blender Version**
Broken: 2.74
Worked: -
**Short description of error**
Screen brightness changing in specific situation
**Exact steps for others to reproduce the error**
Lowpoly mesh as "Wire" DrawType and just changing vertex position.
{F206700}
https://youtu.be/MK_MBjENMjg