@bitwise Ah, really sorry to hear about this frustrating situation. You definitely have a rogue, out of date mira.frame.mxo on your machine _somewhere_. Do you get the same out of date message when you open max directly (not through M4L)? As a guess, maybe M4L is opening a different version of Max?
Really sorry I can’t be more help, but if I were in your shoes I’d just Spotlight search for all mira.frame.mxo’s on my machine and make completely sure that only the one exists.