I have this problem on DM 4.5 (which I had to be officially released since I obtained it from RIM's regular website). However, it was also a problem for me with DM 4.2. With DM 4.2 though, it would show that it wanted to downgrade certain aps but never did it. With DM 4.5, it actually does downgrade any aps which were upgraded using the BB's browser.