There are several new known issues with the Google AdWords system. The issues are being worked on by Google and you should know that they will be taking care of them.
(1) Invalid Clicks & Invalid Click Rate Wrong:
Due to a technical issue, the Invalid Clicks column and the Invalid Click rate column from the campaigns management tab are showing 0 for all the campaigns in your account. Our engineers are working on resolving this issue.
Forum discussion at Google AdWords Help.
(2) Billing Tab Is Inaccessible For Some:
Some customers might not be able to access the Billing tabs in their Adwords account. A workaround is to go directly to the pages once you have logged in to your AdWords account, and go to the 'Billing Summary or the 'Billing Preferences.'
Forum discussion at Google AdWords Help.
(3) Wrong Message On Account Snapshot:
There is a message on the account snapshot page about a system maintenance showing the incorrect dates. The system maintenance will take place from August 21, 2010 10:00 AM through August 21, 2010 2:00 PM Pacific Time. Please disregard the dates that are posted for 2005 and 2015, apologies for the inconvenience.
Forum discussion at Google AdWords Help.