No, I haven't. I've been using it daily for quite a while but I do shake it up good before using it. I'm not positive but I think that was recommended, either that or I read it someplace.
Well it has been sitting on my shelf for a few weeks, but it went in my gym bag to the gym and back, plus I did give it a shake. I would have thought that would give it a pretty good mix.
Okay, I gave it a lot of shaking and it looks like most of the flakes have dissolved. I used it this morning to good effect.