Skipping measures in playback

Hi,
During playback, I noticed a couple of measures were being skipped. I.e. My song would play up until a certain measure, and then completely skip that measure and jump to the next measure. Then during a repeat of that section, the skipped measure would end up getting played. But then another measure further into the song would get skipped. Just these two measures are involved; no others. So, the problem is not just random. Any ideas? I checked the measure properties and the object inspector for each measure, but didn't notice anything obvious. I don't really know what to look for. Thanks for any help.

Vince Deegan

P..S. Attached, is my file. The skipped measures are measure 9 and measure 15. The version of MuseScore is 0.9.5, revision 2012.