Since Sunday, some are reporting at WebmasterWorld sporadic issues with Google AdWords. When you log in, some are noticing that the campaign summary data is missing from the page. They then log back out and then log back in, and it reappears.
Normally I would dismiss this type of bug, but we have several people over the past three days confirm this to be an issue.
Google is aware of the issue and said they will look into it. But it does not seem to be wide spread, nor does it seem to be a persistent issue.
At first, I thought it could be related to the U.S. time zone change but who knows.
Forum discussion at WebmasterWorld.