Hello. The rig I generated has a thumb, and I see the controls exist in the outliner, but it's somehow not showing up in the viewport. Tried to see if the visibility was turned off anywhere in the hierarchy but not seeing anything intuitive. Currently doing a work around by creating a nurb controller and constraining, but it'd be great to know what's happening here. Image attached. If it helps, maya file can be downloaded from here: https://drive.google.com/file/d/1fXnlDpeSyCJID4tkVnRhFhaaaBtS0TMM/view?usp=sharing NOTE// I am using maya 2023.
Thanks you!

Thanks for sending the file, that made it much easier to track down the issue.
In a FK module with only one chain where the first joint proxy is at the exact same position as the parent proxy, then the controls have no scale. I have updated the code to use the position of the last joint in the module to determine the control size, which should resolve your issue. This change has been made in version BETA 3.0.2 available at www.rapidrig.com/download-rrm3
Dustin
Brilliant! Thanks so much Dustin!