Hello,
I installed yesterday:
1. Bitcoin Core Client v0.9.3.0
2. GUIMiner v2012.12.03
I registered an account at mining.bitcoin.cz, added account_name.worker_name as username at GUIMiner, set Server: slush's pool.

Client and miner are running fine. Miner shows 360 Mhash/s, accepted shares count is incrementing.

mining.bitcoin.cz -> My Account -> Workers
shows all zeros (Found blocks=0 Current shares=0 Score=0 Last share at=- Ghash/s=0)

What am I doing wrong?