Cannot open digitally signed PDF's with Acrobat but can with Reader.

My users have PDF files that have been digitally signed by other users.
When opening these files with Adobe Acrobat Pro, it crashes the application.- a generic referenced memory error on some systems, a DDE server error on others, or a font capture error on others - not sure why the discrepancy there.
The files can be opened with Adobe Reader with no error.
We are at Acrobat 9.4.5 and Reader 9.4.5
I have uninstalled and reinstalled Acrobat Pro 9 and verified the same result with Pro 9.0 so it isn't the version or an update.
I have verified this on multiple machines. - I have even installed both pro and reader on one machine and verified that I could open the PDF file with Reader but not Acrobat Pro.
We can open other PDF files with no problem.
I have tried disabling as much of the security options as possible but still get the same result.
If I clear the PDF file fields (including the signatures) in Adobe Reader then it can be opened in Adobe Acrobat Pro.
Does Acrobat Pro authenticate the digital signatures differently than Adobe Reader?
Thank you in advance for your time.

Hi J.O.S.,
Regarding your question "Does Acrobat Pro authenticate the digital signatures differently than Adobe Reader" the short answer is no.
However, there are other things that Acrobat can do with a file that Reader cannot, so there could be an operation that Acrobat is trying to execute (other than signature validation) which is causing the crash. You don't see it in Reader because Reader doesn't know how to do whatever the offending operation is.
That said, can you send me the file that is crashing Acrobat to [email protected] and I'll see if I can figure out what is amiss.
Thanks,
Steve

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