Trying to play any video from the NT221 mobile.Ed resource will crash the current beta - either from clicking the embedded video from the textbook resource,
8054.LogosCrash (6.3b1).zip
looks like this:

or opening the separate vodeo resource from the command box:
0447.Logos Crash (6.3b1#2).zip
The crash will not leave a Logoscrash.txt log file (last is in the first zip, dating from March) and not update the LogosError.log file either (errors logged are from a Reading Plan sync item issue I have for longer than 6.3B1).
The textbook resource is
LLS:NT221WITHERINGTON / 2015-03-30T20:18:47Z / NT221WITHERINGTON.logos4
the video resource is
LLS:NT221WITHERINGTONVIDEOS / 2014-10-28T23:43:52Z / NT221WITHERINGTONVIDEOS.logos4
and it will play any videos from bible.faithlife.com for me, but not from app.logos.com (endless "loading...")