Enable all features clears my Form

You can recover the data by opening the document by selecting "open with" and "chrome" and all of your edits should be in the document. 

I'm kind of appalled at the assistance given on this thread.

Enabling all features IS required before digitally signing a PDF.  Enabling all features in this case is refering to dismissing secuirty measures upon opening a file (also required in order to print).  Not something done at form creation as some here seem to be confused about.

Questioning the users reasons for enabling all features is a waste of time and irrelevant.  Enabling all features upon opening a digitally signed pdf should NOT clear the digital signatures.  The issue is:  Why is this happening, and what can we do to fix it.

I would like an answer to this myself, as I am in the same boat.  This seems to only be happening with one specific file after working flawlessly for months, so I'm wondering if it isn't some form of file corruption.  Any useful information would be greatly appreciated.

If you want to sign a docuement after someone else has signed, you can either add another digital signature field to go along with the one that the user signs, or include the document as an attachement to a different one that you sign/certify. The first option is typical practice.

Have you enabled the protection mode?

"Enable all features" needs to be done before the file is sent out. It doesn't make sense to do it on a filled-in file...

Also, this is no longer necessary at all, unless the users have a very old version of Adobe Reader. The current version can save filled-in forms without these rights applied to the file.

Can you tell us why you want to "enable all features" after the document has been signed? There's likely a better way to achieve what you want. The more information you provide about your intended workflow the better.