RIR Rhino interface not displaying toolbars

Certainly. What we are doing is troubleshooting, eliminating possible variables.

To remove Revit addins the quickest way to test is to open a new instance of Rhino.Inside.Revit with no other Revit Addins loaded.

Cntl+Shift on the RiR start button on the Revit Ribbon, as illustrated here…

If that does resolve the toolbar issue then its a process of elimination using the addin posted above.