I tried the old iCue software and it didn't fix the issue for me. For me the fix was to roll back to the firmware that was on the dropbox posted earlier in the thread. However, with that firmware, the mouse cursor would stick intermittently when being moved from still to in-motion. Once in motion it would be totally fine. However, I changed the polling rate from 1 ms to 2 ms and I'm not having that issue now. So now everything works after running older firmware, using the iCue version at the beginning of the thread, and changing the polling rate to 2ms.
Such a good and versatile mouse for the money. Hopefully there's an update to the firmware that fixes everything for everyone. This is my first Corsair product and feel a bit put off by the whole thing. Good to see there's community communication going though.