Did you try to disable GPU processing ? By the way, Are the links & control points looking good, or is the mess caused by stitching issue ?
Stitch is ok. It´s just the editor presenting the image. Yes - i disabled GPU completely. It works without this messy picrure - but it slows down working and because there IS a GPU on the card i don´t accept disableing it. In 2.6.4 it works very fine. So there is no reason not to work in 3.0, is it? You can´t force users to upgrade their graphic cards - which do their work fine in all applications - just for using APG´s editor . . . .
I learned that there might be issues with ATI-drivers on Macs - but that´s not the user´s business, sorry!
If you want something you´ve never had, then you´ve got to do something you´ve never done.