That's your problem then, no need to get a newer version (it is the new version), just follow these instructions:

From their site below the download:

WARNING: GUI Miner's official release has still not updated BTC Guild's server listing. If you downloaded it elsewhere, use 'Other' with Host stratum.btcguild.com and port 3333, or eu-stratum.btcguild.com for EU. Failure to do this will put you on the getwork protocol which is not recommended.

K.