crash with sonar 8.5 producer and rapture

Hi,
I hope someone can help me with this:
When I am looping a track, let's say that has notes spanning from 1:1:00 to 4:4:480, but I want it to loop from 1:1:00 to 5:1:00, I set the loop thusly. But after it has looped a few times, sonar crashes with an unhandled exception in rapture.dll. It only happens when looping through a time that has no notes recorded in it, for example through 5:1:00 in the senario above. As a related question, I can't get sonar to insert time at the end of a midi track so that it loops seemlessly without crashing.
Thanks for any help,
-Michael.

Edit: Now dimension pro just crashed. I can't figure out why it crashed, because it was working for quite a long time.