Hey @prisonerjohn I see this issue on OS X.
Seems like a regression.
With AVF on OS X we are using AVF's internal texture by default - if I load the pixels from the video into a ofTexture that texture shows fine.
On windows there isn't an optimized texture being generated by the internal player itself so the ofVideoPlayer makes one which respects the ofDisableArb call.
I posted an issue here:
Thanks for reporting this!