Ugh....got this tonight.
I googled it & made the xsn into a cab, Tried ripping out the offending lines from the manifest file in notepad..over& over & over....I prolly tried it 25 times or more; same error on a new line. It finallly started erring on forms & stuff that I know are current and necessary.
Interestingly, I tried backup file from a couple of sessions back and while it'd open in IP, it gave me the same type of error when I extracted the manifest and tried opening in design.....wierd.
Any hope here or am I gonna be set back to the previous save?