Thanks, Myra. I didn't save a version of the file with the show/hide on rollover/roll off. If I have time to see if I can recreate the problem, I'll send it along.
Let me take the moment though to say how much I love and appreciate in5 and all the cool things I can do with it.
Also, I realized after I changed all the buttons to show/hide on release or tap, that I could probably have achieved the reveal-text-on-rollover effect I was after, just by using the rollover appearance state, which always seems to work fine, instead of the Event->Action.