Had significant issues with the Chrome Web Store yesterday - images not loading from some content servers, extensions failing to install ('The extension file was not a CRX'). I guess this was the cause.
"That quota service experienced traffic problems today due to a faulty load balancing configuration change. That change was to a core piece of infrastructure that many services at Google depend on. This means other services may have been affected at the same time, leading to the confounding original title of this bug."
