In LR1 you had locate folder or the question mark. LR2 Beta is the same but the latter method has the bug you found. Fixing the folder location is often better as you can fix a folder and all its subfolders in one go.
In general though, it's better to try to use Lightroom and not Finder/Explorer for moving files around - then you won't have to fix things afterwards.
Good point I will have to start doing that. Generally i build a folder while in the field on my laptop harddrive then move it offline after I have done the major edits. This allows me to work without an external drive on planes etc ...but I am limited to maybe 30GB after that its time to move it.