[MattJ2000]

In case it matters, the previous behaviour would be spinning wheel, then immediate refresh rate change (screen goes black) then return to first frame of video (90% of the time this is black) followed by set amount of delay & then playback begins.
I see now, rather than this, the spinning wheel comes up, refresh rate changes, then back to spinning wheel (rather than a hold on the first frame, the hold is on the spinning wheel).
Don’t know if this change in behaviour points towards why an m2ts would no longer work correctly?