Hey guys, I just installed one mor GPU - then started cgminer and it was all just fine - all cards worked with no problem. But when I restarted cgminer I got problems. The miner itself starts and shows the data that it found the pool and connection - but when it switches to mining the cmd windows is just black. No data shown. The powerconsumtion rises like it should - that means it's doing something.. but I can't see it. I use cgminer 3.7.2 on Windows 7 64 bit. This is what is shown before it switched to mining:
Try running cgminer with the -T (no ncurses) and --per-device-stats argument(s). E.g. cgminer --blake256 -T --per-device-stats --benchmark