Beats per measure is off by one.

In working on a score in 12/8 time for piano the bass line measure will only permit 11/8 worth of notes. Previously the score is in 9/8 time and this is the first measure of 12/8 time. I have tried to reset the time signature and also closed Musescore completely and reopened with no success. On reopening the file it reports a 'load error' noting the measure and the note value difference.

I am using version 2.0.2 revision f51dc11

Suggestions?