I'm getting these  errors with 4.5c on 8x p106 rig   :

NVAPI error in NvapiWrapper.c:445 : -6
Unable to load NvAPI: error 3
Eth: the pool list contains 1 pool (1 from command-line)
Eth: primary pool: eu1-etc.ethermine.org:4444
Starting GPU mining
GPU1: unable to init NvAPI with bus ID 65536
GPU2: unable to init NvAPI with bus ID 131072
GPU3: unable to init NvAPI with bus ID 262144
GPU4: unable to init NvAPI with bus ID 327680
GPU5: unable to init NvAPI with bus ID 393216
GPU6: unable to init NvAPI with bus ID 458752
GPU7: unable to init NvAPI with bus ID 524288
GPU8: unable to init NvAPI with bus ID 589824

After these errors , Miner seems work like 4.2c  

Any idea ?