Back in November 2005 I posted an item about a problem I was having
with Access 2003 SP2 crashing when attempting to compact an mdb file
that had refererences to mda or mde files.  It would crash only once if
the project was not digitally signed.  If it was digitially signed it
would crash on every attempt to compact.

I reported it to Microsoft and there is now a hotfix available for this
issue.