Try a full shutdown of the system. Then power back on and see if that helps if you have not already.
That had fixed my scrypt mining issue with this last update.
MultiMiner having problems with GPU on one of my computersHi.
A few days ago I've built a computer with some spare parts (Asus Z87I WS, i5, 16 GB RAM, Gigabyte R9 270X 2 GB, Win7Ult, Catalyst 13.12) but I have a problem with MultiMiner (my preferred mining application).
The application detects my GPU but as soon as I set the optimal settings (--thread-concurrency 15232 -w 256 -I 19), settings that worked perfectly with the same GPU on another computer, mining doesn't start. If I leave the settings field blank or I set the thread concurrency to a low level (e.g. 1024) the GPU starts mining but just with 6-7 kH/s.
I tried to use GUIminer scrypt (with CGminer) with the optimal settings on the same computer and it works giving me about 450 kH/s.
What could be the cause of this problem?

I'm working with MultiMiner on my main mining computer (with the same OS) and it is working perfectly.
Thanks.
Bye
lcettuzzi