Adobe Signature Invalid - What Gives???


i trying digitally sign forms application.   click advanced, sign , certify, , sign document have.  however, after signining, grey box pops says "there error when attempting commit signature.  document not saved.  file may read-only, or user may have open.  please save document different name or in different folder."   however, saving doc different  name alreay, , it's not read or open someone  else. 

 

when close , reopen document, document digitally signed , signature looks has.  however, @ top of page, there a blue signature panel says "at least 1 signature invalid."  when click signature panel there option "validate all."   however, when click it, nothing happens.

 

how fix this?   i'm using acrobat pro 9 on windows 8.1

 

thanks!

acrobat 9 not offically "supported" on windows 8.1 - acrobat 11.0.4 or later , acrobat 10.1.8 may have it. however, error sounds more windows permission issue. did problem start occuring after update?



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