Adobe Reader v9 & Digital Signatures

I have some pdf forms, created in Adobe LifeCycle Designer 8, that have digital signature fields. We recently upgraded to Adobe Reader v9. A user completes the form & digitally signs it, then emails it to a supervisor. Since the upgrade to v9 when the recipient views the form they get a message that the digital signature are not verified. Any advice?
We're running on Windows XP.
Thanks in advance.

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