Another bug in the TB-7 MF 40 and Pe-8 bombsights: It is not possible to enter speed, altitude or elevation in DGenPack:
The last three screenshots are from stock game, no problems.
(Click to zoom)
Edit: The problem is in the OPB-2 and the OPB-2 Type 90 Mk1, in all aircrafts that have these bombsights, with the added bug of minimum zoom (like the DB-3 bug, reported some posts above) in the Betty.