Did you update your AdWords Editor versions 9.5.1 and 9.7.1?Posted by on September 23, 2012 05:14 AM
As Google announced
in June, AdWords Editor versions 9.5.1 and 9.7.1 will no longer be supported
after October 28, 2012. If you continue using version 9.5.1 or 9.7.1 after this
date, you'll encounter errors downloading accounts, posting changes to campaign
settings, or checking changes. To avoid these issues, please upgrade to the
latest version (9.8.1) at your earliest convenience.
You can upgrade to version 9.8.1 through the auto-update prompt that appears when you run AdWords Editor. To preserve unposted changes and comments, select the "Backup then Upgrade" option in the prompt. You can also download the latest version from the AdWords Editor website.