Definitely some compatabilitiy issues there. Had to reinstall 6.0.5 in order to recognize all available ports on my card. (This is on my 733G4 tower,1 gig RAM, under 10.2.6.)
I am using a Tascam US-428 on my new Powerbook with somewhat sketchy results with 6.0.8.1, though not as crippling. I've gotten some strange redraw errors when highligting in the editor, and, to be a little nit-picky, I have to re-check the "Audio record input select" in the sections panel every time I open an existing file. I wish it would remember my set-up.
As a newbie myself to most of this stuff I accept challenges as part of my learning curve, and don't blame the software. All and all I am very pleased with my investment.
Thanks for the good work in progress, it only seems to get better.