**System Information**
CentOs 6.5, Intel Graphic Chip
**Blender Version**
2.70a f93bc76
**Short description of error**
If I switch to another application and come back to blender, 3d view is not responding.
**Exact steps for others to reproduce the error**
Cant reproduce the error, but if I work in Editmode (not tested in other modes), switch to Firefox, come back to Blenders Editmode - I cant select anything and ctrl-tab shortcut also dont work. BUT If I resize the Blender-Window (doubleclick on the window bar), Blender is back and I can continue working. Maybe it is a bug of my old graphic card. I will continue to ensure.