Sitemap 3.0 problem

Just today I noticed that my sitemaps in WMT showed a red X. I clicked on the link to show the error and saw 3 sitemaps under index. All 3 of them had a green checkmark by them. This just a Google glitch or should I be concerned?

I've noticed random issues with webmaster tools all day today.

Every time i went back there was a different sitemap saying it wasn't accessible and that it was a temporary error.

I would say it's likely google having an issue and to keep an eye on it for 24 hours to see if it resolves it self.

Adsense was down for maintenance today as well

I just checked it again and it looks fine.