> it's like Logic is having trouble redrawing the screen, but I've > changed > nothing about my monitor or display settings. Even the song position > line is not scrolling smoothly, but in big jerks (ditto the song > position numbers in the transport, the numbers are jumping rather than > smoothly incrementing). The audio is fine, though... Another thing I just tried was to log out of my main user account and try running Logic from my Test account (a dummy user that I set up for testing and troubleshooting purposes). Same thing. Slow display update, with the transport and SPL jumping in small increments rather than smoothly running like it used to. I know from my old Windows days that a reinstall is often the best solution for weird issues that can't be explained otherwise. Could this perhaps be the case here? (Either to reinstall Logic, or my entire system fresh?) I'm assuming from the level of responses to this thread that this is not a widespread, known issue with Logic Pro... Brian :::::::::::::::::::::::::::::::::::: Logic Audio Pro 6.4.2 PowerMac G4 933MHz OS X 10.3.4 1 GB RAM MOTU 828mkII - driver v1.09 - CueMix v1.4