Guys, try the latest 0.5.4pre2 version of Vertminer: http://www.mediafire.com/download/533i8bag5fu2f2k/VertMiner-0.5.4pre2.7z

Don't set anything but --shaders and intensity, and let it configure itself, and don't forget it's not --scrypt but --Nscrypt.

My line:

vertminer --nscrypt -I 18 --shaders 2560  -o server -u username -p password