This is defitely related to the second form in the set. I removed the second form and the problem went away. I then re-created the second form, copied all of its controls back from the earlier version, and the problem came back.
I guess this is going to be one of those things I'll never figure out and will just have to work around via trial and error.
"Ignorance more frequently begets confidence than does knowledge."
-- Charles Darwin
"I am invincible! Invincible...OWWWWWWWW!"
-- Homer Simpson