Media Framework 360 Video?

the whole Video play in Unreal is “hit” and miss" even in 4.11.1

Its seems fine in the dev environment… (with low res HD from a Ricoh Theta S) …and looks ok with 4k (demo footage)
but as soon as its compiled to an exe its hit and miss if it works… some setting seems to stop things working even on a PC…on a Samsung S7 Gear VR it worked once…and haven’t had it working since…

Would love it all to work so we could start using this for lots of clients !!!