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1. OV is making 'upgrades', and you just have to be patient - nothing you can do about it.
2. Switch browswers. Many people who don't use the latest version of IE have report various tech problems due to the way OV is coded. It works in a some browswers some of the time, and others most of the time, but few of them all of the time.
I had the exact same problem. After using the Adwords interface for so long Overture's greatly frustrates me from time to time.
To add a new listing, click on the 'manage products' tab and then move your mouse over 'pay for performance search' in the menu and select 'add listing' from the mouse over menu.