Google Webmaster Tools Accounts Access Unverified Over Weekend

There are a bunch of reports in the Google Webmaster Help forum where people are saying they are receiving emails that their Google accounts are "no longer verified by Google" to access their Webmaster Tools login.

The message reads:

[email address here] is no longer verified by Google. Please verify the address or select a different email address.

JohnMu from Google promised to look into the issue, he said:

Thanks for posting! I've passed this issue on to the team to look at. I'll post as soon as I have more to share!

This does seem fairly wide spread, although I personally did not have an issue.

Forum discussion at Google Webmaster Help.