**System Information**
Win7 32, ATI HD4600
**Blender Version**
Broken: 2.78a (msi and zip)
Worked: 2.78, 2.77a (zip)
**Exact steps for others to reproduce the error**
Open file, push right arrow key on the keyaboard -> crashing. Disable IK and it works. Deleting also make Blender crash.
Win console says "Exception Access Violation".
{F401134}