Hi! I've got the same problem here, but only with certain pieces I'm working on. It's extremely irritating. I haven't reported it as a bug, nor do I know how to do so.
I believe I read somewhere that it may have to do with an outdated template. If so, then I guess I'll have to do a full install of Sonar Platinum. That's a shame, because updating from X3 was so darn quick...
Hmmm, I can't see how to add attachments to this forum BB. I HAVE found a template that works without the aggravating behavior, based on the normal template. I've saved it as NormalBehavior.cwt and loaded it here for public use --> [link taken down]
Note that I did manage to revert to the bad behavior, even using this template, so be careful...
The OP (benjaminfrog) has determined that files creating using Sonar X3 templates as a base do not exhibit this behavior. I'd say that this is partially resolved. If you are a new user for this release, then I'd say that Cakewalk still needs to investigate a resolution to the problem.