I keep trying to move apps to my sdcard and this is the message I get. It worked just fine on BB 0.4, but not 0.5.
I would get this from time to time but would repeat the move and it would work on the 2nd or 3rd try. Go figure.
Have you run the script in the BB Toolkit? I would run it to internal, then back to external to see if that fixes. Where are your apps installing by default?
bugless beast v0.6.2.1