On Windows, if the monitor has a 4k (or more) resolution, and using a resolution factor higher than 100% for the Operating System , that happens. I think it is a Windows thing.
@Christoph-Hart understood, thought i would put the suggestions out there.
Isnt the c++ code in an external tile disabled when the ui is not visible , seem to recollect we had that problem. Or do you have in mind that its just a ui object that then runs the underlying default table?
Adding new popups is not the best idea in plugins as this is usually something that will not work consistently across different hosts, so I would recommend trying to work inside the window that you already have.
@lalalandsynth not sure if it works, but if you set all RR groups to 9 and only put in a sample in a single group (so sampler 1 has a sample in RR group 1, sampler two has a single sample in RR group 2 etc) you might get your voice allocation across multiple samplers.