I have a similar problem. I'm using SequenceGeneratorPro, which uses the ascom driver for the EFW2. When I first power on and connect the filter wheel in SGP, the filter wheel reports it is "moving" even though the wheel is not physically moving. I can't start the exposure sequence because SGP can't move the filter wheel to the correct filter. If I unplug the filter wheel and power it back on, the FW will report correctly, starting up on filter 1. This is repeatable.
I did not experience this problem before recently updating to the latest Atik drivers due to installing on a new computer.
I don't know if my issue is related but thought I would mention it here just in case.