Have been out of action as my hard drive packed up so been restoring everything that was on it. One curiosity when doing this relates to the option to choose ACP(hub) from ASCOM. This seems to have disappeared as an option in my rebuild - but when i drop down to ASCOM 5.0 it reappears. If I stick backin the ASCOM 5.5 update the option disappears again. Any idea what might be going on here ?

Thanks, David