This is really bizzare... Someone call Kanoi or ckolivas, Hell even Luke-Jr could help.
This is probobly a Stupid question, But have you tried cleaning the drivers via AMD's driver cleanup utility? (I have harsh doubts that this will even make a differance since your btc mining is fine)
I had but for some strange odd reason it did not delete following files so i went to safe mode and deleted the files manually from system32 and syswow64
amdave32.dll
amdocl.dll
amdocl_as32.exe
amdocl_ld32.exe
amdpcom32.dll
opencl.dll
After that i reinstalled 13.4 but same issue so i decided to go beta route and repeated the above deletion and intalled 13.6 beta 2.....Wow now i can mine litecoins using my XFX 7970 but dumb graphics card only produced 350 KH/s at best until today i stumbled upon following:
cgminer --scrypt -o pool -u username -p password --shaders 2048 --thread-concurrency 8192 --intensity 13 --worksize 256 -g 1 --gpu-engine 1100 --gpu-memclock 1800
now i can mine 590 KH/s. Good but wait, there is more lol. It went on mining for like an hour and computer restarted resulting in corrupting some of my virtual box machines (completely different topic altogether but i managed to recover from this after spending couple of hours recovering my database) so now i am sitting duck and scared to try again lmao. My mistake i should not have tried on production machine but regardless i dont know why computer restarted itself all of a sudden with above settings, i am thinking beta drivers perhaps but i am scared to try something until probably sunday night when nobody is using VMs so i can safely shutdown VMs and try different drivers or parameter for cgminer. Any opinion or suggestion ? much appreciated...