I can test later today for regression but i cannot test the 3D subtitles in SBS 3D cause i don't have any SBS 3D.Kotik, are you able to test a new bin ? (but you need to update to latest madVR version in first post).
I'm on V337 here with change that will only works with MPC-HC engine, in fact i reset the width when we are in SBS or TAB but i can only do that for the upper eye (TAB) or left (SBS) but it works.