Great Work, I have been testing the new cgminer 3.7 with Win7 64, R9 270 and Catalyst 13.12. Runing without problems for about 12 h.
Hash rate and power consumption are similar to the 3.6.6 Version but he amount of Coins dropped. Did i miss a change in difficulty ?
Please take a look at mining history on your stats page, important is your percentage of work. If that has changed significantly over the last day when the pool and network hashpower was constant (give or take, at least there were no 5x-10x jumps), something might be wrong.