The quick fix that i applied today made me reduce the worksize from 0x80000 to 0x8000, which will introduce a HUUUUGE latency in faster cards. I'm working on a solution for this just about now.
Ok, NEW VERSION OF GPU MINER RELEASED! Fixed the "0x8000" worksize, so the speed drops might stop for now, and should be a little bit faster!
Linux and Mac OSX binaries also available! (Windows, of course, still available).
Download link:
https://www.dropbox.com/sh/2wv2awwgebpdo0m/STzOU5tlXasource code:
https://github.com/girino/xptMinerHope you enjoy!