thank you the updated version works
but i think my graphics card is not ok, if i set I bigger then 9 i get
[2013-06-12 08:18:46] GPU0: invalid nonce - HW error - d17e2089
[2013-06-12 08:18:47] GPU0: invalid nonce - HW error - cdb3c1f4
[2013-06-12 08:18:47] GPU0: invalid nonce - HW error - 2f63b98a
[2013-06-12 08:18:47] GPU0: invalid nonce - HW error - b428d90b
[2013-06-12 08:18:46] GPU0: invalid nonce - HW error - 71a9f146
[2013-06-12 08:18:47] GPU0: invalid nonce - HW error - 36910f4a
guess its running too hot on intensity higher then 9

What's your thread-concurrency setting? Try increasing this number.
If you meet HW error, it might be the cl kernel not cover your GPU, you're running 6950 right? I don't have the card for testing.