Cover art for movies

Guys, my movies are showing up and playing just fine, but unlike my music, the covers do not appear, so that when viewing in the web UI, it looks sloppy. I maintain perfect album art for all music, works perfectly, and I do this by embedding the album art to every file (no cover.jpg or things like that). For Movies, I use Subler to apply perfect movie covers to my .m4v files that result from Handbrake 0.98. The movie covers show up fine in iTunes coverflow, but for some reason these embedded covers do not show at all in Subsonic. What am I missing? Thanks very much guys, I am liking 4.7 VERY much, and it has re-inspired me to leverage Subsonic much more. Just need to polish a few things before going "live".