Not sure if this is a bug or if I just missed something.. but I've installed LR3 on over 10 systems so far and have only had trouble with 1 of my 3 personal systems. My workstation went perfect, it converted the catalogs and brought over my plugins and settings with no issues. Same with one of my laptops. With both, I rebuilt new indexes and previews anyway.
My problem comes with a Dell M6300 Precision Mobile Workstation, a higher end laptop.. and what's happening is anything in my catalog and anything I try to import in the import dialog box.. is grayed out. There is a square present for each image, but no image. When you first access a directory you can see it flash on the actual file names.. but then it quickly/instantly turns to gray squares.
At first I figured something was wrong with the install.. so I uninstalled it, deleted all LR files completely from everywhere, from the user directories, common directories, registry, etc.. Installed fresh and it did it again.
I wonder if this is an 'activation' issue? I've always used LR3 on 3 machines but I wonder if they somehow made it like CS4/5 and only usable on 2 machines.. but forgot to add the activation/deactivation controls?
Adobe support is closed over the weekend, opens at 0700 Monday.. so I'll have to call in and ask. I haven't seen this issue discussed anywhere else.