Installed the 14.6 drivers and miner last night and was getting 4.2Mh on my 280x cards. However I would find that one card's load would drop to 0% after anywhere between 10min and an hour.

Uninstalled 14.6 and installed the 14.4 drivers and 'fixed' miner from the OP. I'm now back to my normal 3.2Mh on X11.


EDIT:
I pulled the .bin file originally generated when 14.6 was installed and I was getting 4.2Mh. Ran it in the fixed miner with 14.4 installed and I'm now getting 4.0Mh. Not quite as fast, but better than 3.2. Will monitor for stability.

EDIT EDIT:
Probably getting 4.0Mh instead of 4.2Mh as my clocks are now my normally set 1049 instead of the 1100 factory default I was getting stuck with under 14.6.