MIDI files

Having finally updated to OSX 10.15.6 I've lost use of that great MIDI file player Rondo (such a shame). I've now associated MIDI files with pianoteq but when these are modified on disc and reopened in an already running pianoteq (v6.7) the old data is retained. Even reloading manually via Recent MIDI Files doesn't seem to update, rather, I have to quit pianoteq and reopen. I can't find a menu/option to solve this problem so perhaps it's a bug? Best, Michael