I have upgraded from OSMF 1.0 that comes with FB 4.x to OSMF 1.6, now with no code change, the video (local files) are not getting loaded, the call mediaFactory.createMediaElement(resource) returns null, but if I switch back to the older version, video is loaded just fine...
I think it could be a stagevideo-related problem.
please set OSMFSettings.enableStageVideo = false in your video player code and try to play your assets - this will allow to rule out this problem. Can you hear the sound?
You could test the samples from release 1.6 to check if you meet the same problem.