Here are some photos of the situation. Is this the same for your Rob?

I'm wondering if it's not adjusted far back enough because I can see on the other side of the track about an inch of unused track where the other roller is not going all the way to the front.

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http://911rsclone.com/photos/window_...r/pops_out.jpg

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http://911rsclone.com/photos/window_...ack_unsued.jpg

Hi Cary - that's exactly what was happening. I ended up removing the track from the bottom of the window and re-attaching it about an inch towards the rear.
There are lots of threads about what adhesive to use, but I ended up just using some silicone - so far, so good.....

Still not sure how why it started happening in the first place....

Good luck, Rob

Hey, that sounds like a pretty simple solution now that I think about it. No replacing of parts involved too which is good. I'll give it shot. I'll research removal and reinstall of the window. Thanks a lot! This is why this board is so great.