AdobeLiveCycle ReaderEnablement but cannot sign in Reader
I have a pdf doc that i ReaderEnable through the applyUsageRights service via Adobe LiveCycle (for digital signatures and form fill in). The problem is that when i open the doc in Adobe Reader 9, i cannot sign - when i click on the signature tag, i get the error message:
"the selected signature plug-in failed to supply the required signature information. Expected a string object". I was wondering if there is anything that could be breaking the usage rights?
if i create a new pdf in acrobat professional 8 with a signature tag, then say 'Advanced->Enable Usage Rights in Adobe Reader', then open the doc in Reader, the signature works fine. I can't understand why enabling usage rights done from Pro allows me to sign, yet when applied form LiveCycle it doesnt work.
Any ideas are welcome, i cant seem to find the problem after hours of research!
Thanks very much.