When I compare 2 documents Acrobat 9 crashes

Question

When I compare 2 documents the progress bar will come up and will not disappear.  Eventually the following error will appear
Acrobat.exe - application error
The instruction at "0x0000195a" referenced memory at "0x0000195a".  The memory could not be "written".
The above error also comes up if I click on the Progress bar for Document Compare.
Acrobat then crashes.  We are running Acrobat Pro 9.5, and have this happening on multiple machines
Thanks

Answer 1

Hi, I have had a similar problem in Acrobat 10.1.9.22 for *specific files*, and talking to the Adobe tech support, they were also able to reproduce the crash with Acrobat 11 with these files, so it sounds like this bug is definitively not fixed yet.
The bug:
- When comparing 2 documents (View | Compare documents...), after some progress, Acrobat crashes (on my Windows 7 machine, it says "the application stopped working", the exception reported for me is c0000005 which is according to Google a memory access violation code). This will happen only on some *specific* .pdf documents (though it will be systematic for these). I am able to compare other .pdf documents fine without any issue.
** Current workaround** (thanks to tech support about this): You basically 'clean up' these bad .pdf documents by converting them to postscript and then back to pdf:
Instructions for Acrobat X:
For each document, do:
1) File | Save as | More options | PostScript
2) Then (in Windows at least), right click on the .ps file and choose "Convert to Adobe PDF" to convert it back to .pdf.
Now the convert the two documents should work fine with these 'refreshed' documents (hopefully).