AES256 encrypted PDF crashes Acrobat X but works for 9.x

Hi,
i've encrypted a PDF with AES-256 (Acrobat 9) encryption with a selfwritten PDF library.
It opens fine in Acrobat 9.x but Acrobat X crashes a few seconds after opening.
Here's the problematic PDF:
http://dl.dropbox.com/u/17203884/PdfCrypter_de.pdf
Opening password is "2850" (just the number without quotes)
Preflight 9.x tool doesn't report any syntax error, Preflight X cannot be tested because of crash.
I'm sure there is a syntax problem, can your help me?
When i replace the /StructTreeRoot entry in Catalog dictionary with spaces in a hex-editor Acrobat doesn't crash but
some Contents is still missing..
Any idea what's going wrong?
Thanks in advance and best regards
Dirk Carstensen

Interesting. I was able to confirm that the test ran with Acrobat 9.x on a Mac, but crashes with Acrobat X on a PC. And I made sure my Acrobat X had latest upgrades.
The test seems valid since it was able to run on PDF Interpreter software I work on. This software does support 256 bit encryption, with output matching Acrobat 9.
- Dave

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