Although Photoshop itself seems to work quite nicely, it looks like ImageReady needs more work. In particular the toolbars are broken - I just get black rectangles where the icons should be, and when I task switch to another app the toolbars remain in place, obscuring the app I've switched to. It's OK if I turn them off in ImageReady first though (using the tab key).
Since I can't see the tool icons, I tried to use the tooltips but these manifest themselves as rather ugly windows that appear under the toolbars. Thus I can't entirely see what's in them but I think they're empty.
All in all Photoshop's pretty usable (praise is due...), but ImageReady's still a pain due to the niggles above.