It might be a good idea to backup your gmail account. Now would be a good time. As many as 500,000 Gmail users lost access to their inboxes this morning and some of them are even reporting that years worth of messages, attachments and Google Chat logs have vanished when they were able to log back on. That’s pretty frightening stuff, to think that you could lose all of that info so easily.
Apparently the bug reset some accounts, treating their owners as new users, even displaying welcome messages. Google says that the issue “affects less than .29% of the Google Mail userbase,” and of course engineers are working to fix the issue.