Candsoft, I had some misc compile errors too with initial install of 21.1. I think I closed Delphi and restarted and everything seemed to settle down. Not sure what the errors were now but things are OK. Using Delphi 10.3. Just FYI. Stan
I confirm that RVMathItem.pas was not updated in the Setup.
I'll upload a fixed version later today.
As a quick fix, you can add False as the last parameter on the lines that generate the error.