I get this problem from time to time, mostly if I power up the system in the wrong order and it will fail when trying to connect but sometimes will fail in the middle of the night. Mine will say moving but never get the filter. If you disconnect the wheel and try to reconnect it will still just say moving. When I actually put my hand on the wheel, I can tell nothing is moving. If I look at "Devices and Printers" in Windows there is usually an exclamation point over the filter wheel showing it is not functioning.
Mine was checked out by Atik when I had to send in my camera for warranty service and it was fine. Vince told me that the EFW2 filter wheel does not like USB hubs, of any kind, and unpowered hubs are the worst. I could not get it to work at all on the USB hub in my CEM60 mount but it usually works fine in my powered hub. While they will usually work, there will still be random USB failures. If possible, connect the filter wheel directly to the computer's USB port.
Chris