are we still talking about running mpv from SVP's menu ("open file via mpv")?
and that mpv crashes at the point where SVP kicks-in?
in All settings, put "--log-file=d:\mpv.log" into main.setup.player_args (enter "player" into the search field first)
replace "d:\" with some writable location you actually have
then run playback and send the generated mpv.log file