I created a PDF with Acrobat CS4 on my Mac to use at my school on PCs. The PCs with Reader 8 work just fine but the older laptops I'm also using only have Reader 7 and whenever they save the file after filing all the forms the saved version looses all it's functionality and ability to be edited. I get this message every time I try to open one: "This document enabled extended features in Adobe Reader. The document has been changed since it was created and use of extended features is no longer available. Please contact the author for the original version of this document." Is there any way to renew the file so that I can edit the forms again, or do I just have retype all of them? I tried putting through my Acrobat program and resaving them or saving a new copy and it didn't fix the problem. I can edit them in Acrobat just fine, but once I put it any Reader program (including mine which is as up-to-date as there is) I still get that loss of functionality message. Please help.
Sounds like when you save them in Acrobat, you need to set the compatibility for Acrobat 7 (and Reader 7).
Be sure you are using Adobe Reader 7.5 at a minnimum.