You need to have QuickTime 7 installed; Premiere Pro can't use QuickTime X for import or export.
Also, have you updated Premiere Pro to 5.5.2? Quite a few bug fixes, if you're not already on the latest version. Just to go Help > Updates in Pr to launch the updater.
You are fantastic!
Thank you very much Colin for your extremely rapid response. I just apdated Premiere Pro 5.5.2 and (drum roll) the good news is that I didn't need to downgrade QT X: It just works!
So, for everybody that wants to import ProRes with my set up (MacBook Pro Intel Core 2 Duo 2.66 Ghz with 4 gigs of RAM, Snow Leopard and QuickTime v.10.) it works straight onto the timeline as long as you can live with the yellow line.
Many thanks again,
Cool; glad that helped. And note that installing QT7 isn't a downgrade; they can live side-by-side. It's possible that QT7 is already present on the system (not a Mac user, myself), so maybe it was just the upgrade to 5.5.2 that did it. Whatever it was, glad you're in business!
Also. the yellow line isn't anything to get too concerned about. Check out this blog post for more on the render bars and what their color means: Red, yellow, and green render bars and what they mean « Premiere Pro work area