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Level 4

The suspicion is that you were using the wrong part of the UI for the reader-extending.  So, just to be clear:

1) You must have Acrobat 8 or above

2) The UI for reader-extending a form for fillin is under "Advanced/ Extend Features in Adobe Reader" in Acrobat 9 (I do not ahve an Acrobat 8 at my disposal)

3) The same UI is under "Save as/ Reader extended PDF/ Enable additional features"

With that, it should work.