Elytra doesn't work

So..... I just got the 1.9 pre-release 1 and played around some, but when i went to use the elytra, it didn't work. I checked all my settings and gamerules, still no dice. Sorry if my report sucks, it's my first time reporting a bug. I would be happy if you fix this bug. Thanks! BTW FYI, it has NOT been resolved.