Thanks....I did something and now the mouse scrolling and everything else is working just the way it was before switching to new computer, Sierra and AC20. What I did was to open AC program first and tested the scrolling with the mouse in a blank project. It works well and then I opened my solo project [AC17] and then save my work environment to the new interface.
Lilian Seow LEED AP | cSBA | CAPM | PMP
AC 29 USA FULL | Windows 11 Enterprise i5 3.10GHz | Archicad-user since 1994!