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Level 9

I have not seen this behaviour before.  I would suggest that you gather information about each system when the problem occurs, things like...

Acrobat\Reader version

What is the operating system version (Windows XP, Windows 7 etc)

If you close the document and re-open it immediately, does the problem persist.

Does the error occur with the same policy (a policy can be applied to multiple documents)

You may also want to contact Adobe Technical Support to see if this is an issue they have seen before.

Regards

Steve