I think I may have found the solution to my problem.
There may be an issue with the Xin-Mo USB controllers.

The Xin-Mo controller that I have has an internal identification as: Xinmotek Xinmotek Dual Controller
In the configuration files sent to me, has it is identified as: Xin-Mo Xin-Mo Dual Arcade

Change the name in the configuration file, appears to solve the problem.