Operating system and graphics card
Win 7, (CPU render)
**Short description of error**
Some frames in my file seems to have bug with motion blur, or something similar. Animation is done with explosion modifier and the pieces are very close of each other.
**Exact steps for others to reproduce the error**
Based on a (as simple as possible) attached .blend file with minimum amount of steps
Not exactly sure what causes the problem, so here is the file and my Blender artists thread.