I just hit fifteen earlier this morning and completed my quest to gain the Drunken Style. However, immediately after I recieved my Aum and abilities for this style, Flying Kick dropped off of my chain bar. It also doesn't light up on my standard hotbar after a crit. Can I now, as a Drunken monk, not use Flying Kick?

It's a bug. Sometimes when logging in I don't have some of my chain abilities on the bar, nor does a normal ability macro work for them. Relogging seems to fix the problem.