Good work on the new modes, 4X is looking great on my monitor!
Unfortunately, it looks like a bug found its way into an older feature. 480p content seems to confuse the OSSC whenever it switches to it from 480i on both Gamecube and PS2, it seems to think that it’s 480i at ~120 Hz. It also happens if a 480p signal is being fed to the default input when the OSSC is powered on. Occasionally it will recognize the change correctly, but probably 90% of the time it’s wrong.
A quick fix for it right now is to switch to another input and back, that always clears it up.
My monitor goes up to 120 Hz and accepts the signal, so it was kind of interesting to see everything run like this.