Your CPU lacks capability for AltiVec apps

I've been getting this message for awhile :

Einstein@Home Message from server: Your CPU lacks capability for AltiVec apps

for example...

Thu Dec 23 15:24:23 2010 Einstein@Home Reporting 4 completed tasks, requesting new tasks for GPU
Thu Dec 23 15:24:29 2010 Einstein@Home Scheduler request completed: got 0 new tasks
Thu Dec 23 15:24:29 2010 Einstein@Home Message from server: No work sent
Thu Dec 23 15:24:29 2010 Einstein@Home Message from server: Your CPU lacks capability for AltiVec apps

I'm not receiving any more GPU tasks for some reason. Does anyone know what's wrong?

I'm using boinc manager 6.10.58
MacOs 10.6.5
My computer is :

Model Name: Mac Pro
Model Identifier: MacPro3,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 2.8 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per processor): 12 MB
Memory: 10 GB

video card is: NVIDIA GeForce 8800 GT:

CUDA Driver Version: 3.2.17 (latest driver installed it says)
GPU Driver Version: 1.6.24.17 (256.00.15f04) ( This line is written in a very light shade of grey for some reason, perhaps something is wrong with the GPU driver...)

When I restart Boinc I get the message below.

Thu Dec 23 18:06:14 2010 NVIDIA GPU 0: GeForce 8800 GT (driver version unknown, CUDA version 3020, compute capability 1.1, 512MB, 336 GFLOPS peak)

So maybe there's something wrong with the driver ?

Thanks for any help !