FYI when using stratum proxy
2012-11-27 21:57:58,967 INFO proxy jobs.extranonce2_padding # Extranonce size mismatch. Please report this error to pool operator!
No problems when using getworks.
Which miner are you using?
CGminer 2.9.5
https://bitcointalk.org/index.php?topic=28402.0 works fine with Stratum for me.