ASCOM Dome driver exception handling error

Hi Leonardo
I am having a problem with a dome driver such that when attempting to connect directly, there is a stack exception generated and Voyager closes.
The code is my own so I can inspect the cause and it appears to be Voyager is calling getAltitude and not handling an Ascom Not Implemented exception . Does this sound right and has it been seen before ?
I am also trying to connect by using the ASCOM Hub device ( successor to POTH) and that doesn;t connect either.
I’ll add the pipe driver and see what I can see. I’ll also run it under debug for the logs.
Cheers
Mike