Well its not just UA. There has been a massive reduction of LH C seats for all *A partners. Something has definately happened since 1.April. I'm surprised that it hasn't been discussed more here on the forums. Surely someone must have more info on this?
With LX and SK (and to some degree UA) releasing a C seat once every leap year, LH was the only carrier with decent TATL award space for *A partners. Lets hope those days are not gone...