Hi JBuck,
yes, the graphical bug is an old one, but AFAIR it is really hard to fix as it is related to some kind of glitch in the graphics library MIR 3D has to rely on. It is not doing any harm to your project and easy to get rid of by changing the height of of the list entrances, but it's a bit embarrassing nonetheless.
Regarding "Roles": I have asked VSL's developers to look into the graphical implementation of this concept again, just to make sure that there is no inconsistency. In the meantime I kindly ask you to refer to MIR 3D's manual - it contains a section that covers this unique feature thoroughly. :-)
-> https://www.vsl.info/en/manuals/mir-pro-3d/instrument-settings#role-presets
Kind regards,
/Dietz - Vienna Symphonic Library