I tested Quisk 4.2.22 with rigctl 4.3.1 on my Ubuntu 64-bit system using rig model 2 and the "F" and "f" commands worked fine. I tried using your model 10 but my rigctl reports that there is no model 10. What is model 10?
There should be no difference between a 64-bit and 32-bit OS, and I doubt that is the problem. What happens if you use rig model 2?
Jim
N2ADR