Weird one this,

In powerpoint 2010, we have a reproducible crash on all machines

All we want is background music on all slides, so in the first slide we added a mp3 (crashes with wav and wma too).
Under playback hide during show.
Custom animation - start playing from beginning, and stop playing after all slides.
crashes everytime with this

Problem Event Name:	APPCRASH
  Application Name:	POWERPNT.EXE
  Application Version:	14.0.6009.1000
  Application Timestamp:	4cc1a4ed
  Fault Module Name:	ppcore.dll
  Fault Module Version:	14.0.6111.5000
  Fault Module Timestamp:	4e713cca
  Exception Code:	c0000005
  Exception Offset:	0031f1f5
  OS Version:	6.1.7601.
  Locale ID:	2057
The slideshow works on 2007 just not 2010, and it's crashing on all 2010 office machines (just so happens to be the assembly machine...)