using GUIMiner, When I try to start mining, I get alot of the following

2011-08-25 11:07:32: Listener for "GPU": pool.ABCPool.co:8332 25/08/2011 11:07:32, long poll: IO error
2011-08-25 11:08:19: Listener for "GPU": pool.ABCPool.co:8332 Problems communicating with bitcoin RPC 0 2

the status bar shows it's running and a hashrate, and the pool shows me getting credits, although with some invalids and stales (i'm new, so i don't know wtf that really is)

GUIMiner version: v2011-08-23
Operating system: w7-64
Miner backend: OpenCL/poclbm
Video card: ATI 4800 series
Server: ABCPool