I click on "fill&sign" but when i click on the appropriate field in the document I can't fill it in. The document has signing permissions. I also tried it on a document that I successfully signed about a year or 2 ago, and I couldn't sign that either. Any help is appreciated, thanks.
As per the issue description mentioned above, you are unable to fill the document using fill & sign, is that correct?
Try rebooting the machine, relaunch Reader/Acrobat and try filling the form again. Also, check if there is an update available for Reader/Acrobat-click Help>select Check for Updates.
You may refer to the following links discussing the same issue:
Could you please let us know the version of Reader/Acrobat installed on the computer?
Which Operating System is installed on the machine-Mac/Windows?
Awaiting your response.