Ok, still having the same problem with .85. I completely uninstalled and did a fresh install of the new beta and I still get the "Login Failed. You may have missing or stale registry data. Try running Fallen Enchantress with the command line parameters / username "myusername" and / password "mypassword" (replacing the values in quotes with your actual username and password)."
I've tried that, and still get the same message about the name in the target box not being valid. I really don't want to have to try and deal with registry keys, so I'm more inclined to just give this up as a lost cause, but I thought I'd ask one more time. Thanks, and here is hoping.
Sigh... I was really looking forward to this game.