Masque of Slaanesh dances not working?

Playing the Masque of Slaanesh right now, having a good ole time, Slaanesh infantry is NASTY. However, the dances don't seem to be working correctly. I can't use any of the affects that are shown in the third tier of the dances. I also used the "ultimate" affect once and now it's greyed out for ever on that particular army, even after changing dances to a new one and earning enough tempo to use it.

Anyone else run into these problems? Any known fixes?