Asleep: Yes, I read your post, I saw you were using E6B. Sorry for not clarifying my reply by saying my guess is that it's tied in with that bug. It might not be the same exact thing, but it could be a side effect of it.
Have you tried offline where you set the flight flags to see the green "X" where your bombs will drop?
Can you calibrate and then check to see if the bombsight matches the "X", or is that not possible? I haven't tried that in a long time.