A quick update.
Sam from ZWO has kindly offered me a couple of solutions (trying a new USB3 root hub controller and trying the ZWO EFW Tool).
Unfortunately, none of them make much difference.
I can move the filter wheel, but somehow the programs (Sharp Cap, Images Plus, Sequence Generator) just cannot connect to the EFW.
When I tried to setup the EFW under the ASCOM dialogue window, I get an exception error. I have attached the error message in the attached text doc.
Maybe someone can help me decipher it?
Thanks
Bo