I had the same problem; h2o explained that was because he wasn´t recording ltc blocks after eu server changed to mine LTC. After that period we experienced an increase in "unexechanged" etc due to those blocks, so everything went back to normal. I think the main problem now is that we are mining ltc on eu server that is not the most profitable coin now and thats why our profits decreased dramatically.
Ok that make sense, since my rigs were all pointed to EU servers.
Although if I were mining LTC straight, I would expect to get ~2x of yesterday payout from MC (i.e. ~8.5Mhs accepted / 3.2 * 0.029 = 0.077 BTC vs actual 0.038 BTC)