I'm having problems with the morph slider ever since I switched to a newer Macbook
The slider doesn't do anything, no matter what preset/patch I'm working on

Anyone else experienced this? Anyone know a fix?

I can't help except to say it's working fine here in Windows 11 as both VST2 and VST3.
I assume it worked for you correctly previous to the MacBook change? What version of plugin? (And have you also tried any others)? Are you sure you're running the latest version of Microtonic (from the newest installer)? What host? Maybe try a different host?

(Regarding my first point, (whether it worked for you previously)), I don't think everyone realizes the morph function is intended to morph between two presets. If it looks like it's not working, load Beatscape, or load a second preset, then try to move the morph slider and (at least here) the settings will change between the limits assigned by the two presets.