It seems that whenever I edit the rollover state of a button, I accidentally change the normal state. When I try to duplicate the mistake to fix my earlier one, I can't change the normal state, no matter what I seem to try.
Can anyone help?
I'd try restoring your InDesign preferences as a common troubleshooting solution:
Or if it's only one document, it could be the document has become corrupt:
Retrieving data ...