No worries!! When the client won't sync, I have always just exited, and reopened. Seems to do the trick.
Now all we need is to get this on an exchange!!!
No... I've exited and reopened a few times...... and redownloaded the client 3 times and scoured this post for every addnode I can and left it running for hours hoping it would sync up. No luck, whatsoever. Had this problem with the Argentium wallet, too... would not (never ever after probably a dozen re-installs and every addnode I could find) sync past block 499 and with the new Protoshares wallet. Luckily, the new Protoshares wallet has a version with live node hardcoded in and that one worked for me. The other 43 currencies I've either bought or mined haven't been a problem, just WUBS, ARG, and PTS.