i just stumbled over something:

my miner appears as a "HEXa" in cgminer. as far as i kno it should appear as a HEXc. Is it possible that this is my Problem? How can i get cgminer to accept the device as a "HEXc"?

EDIT:

IT WORKS!

Sometimes its those little things.

IF you encounter the same problem:

start cgminer with

"./cgminer --set_default_to_c"

that did the trick for me