Works fine here from BT4 with or without a macro.
Did you try that while not being grouped? You will get no bars then.
Nope was in a raid. Will try again in the next raid to find out more about it. It was definitely not working when using it from BT4.
Anyway I noticed with some of my chars that I needed to relog to get some skills working properly (especially rogue). As I was using RBM and the drum module for the first time that evening it could be related to this behaviour. I'll let you guys know what I find out.