Phoenix Miner 2.0 Configured for GPU, Running CPU

I have configured Phoenix Miner 2.0.0 to use my GPU (I think), but it pegs both CPU cores and doesn't touch the GPU.

Code:

[general]
    autodetect = +cl -cpu
    verbose = Enable 
    backend = http://<user>:<password>@bitcoinpool.com:8334/ #The user and password of course contain the real values
    failback = 600 
    queuesize = 1 
    queuedelay = 5
    statusinterval = 1
    ratesamples = 10 
    logfile = phoenix.log
[cl:0:0]
    autoconfigure = False
    kernel = opencl 
    name = GPU 0 
    #start_undetected = False #if I uncomment, it doesn't process anything
    disabled = False 
    worksize = 256 
    vectors = True 
    vectors4 = False 
    bfi_int = False 
    goffset = True 
    fastloop = True
    aggression = 1

Results of uncommenting start_undetected:

Code:

[07/04/2012 03:51:14] Welcome to Phoenix v2.0.0
[03:51:15] Connected to server
[0 Khash/s] [0 Accepted] [0 Rejected] [RPC (+LP)]

This has normal levels of CPU usage.

Results when commented:

Code:

[07/04/2012 03:52:41] Welcome to Phoenix v2.0.0
[03:52:44] Connected to server
[03:54:25] LP: New work pushed
[751 Khash/s] [0 Accepted] [0 Rejected] [RPC (+LP)]

This has both cores of the CPU pegged at 100% and nothing on the GPU.

Code:

GPU: ATI Radeon HD 2400 XT
OpenCL: Looks like 12.6 (I just downloaded it today, 2012-07-04)
CPU: Intel Core 2 Duo E6750 @2.667GHz
OS: Windows 7 Ultimate

Do I have a config problem?