I tried it in Webkit too, Jim. Still results similar to yours and/or blank page. I don't know what's going on - maybe I'll post this in the Photoshop Express forums.
Not that I think I'm a customer for this service, as I have PS CS3, but still wanted to have a look!
EDIT: Tried removing and reinstalling Flash Player even though it is the latest version and still no go on my G5. I don't know what's up with that - NO browser works. Then tried accessing the site on my MBP, which is a far more "pristine" system and has all the latest of everything and Bingo! No problem. Just had to lie and say I was in the US.
Might prove to be another handy spot to share pics.
BTW - if anyone is alarmed by their TOS which makes it sound like they can trot off with the copyright to your photos, apparently Adobe legal is working on that after hearing from lots of people who actually read the agreement and were somewhat taken aback. Adobe realizes that those aren't terms most sane people would agree to - there will be a new agreement shortly.