On Thursday I sent an email to Blogger.com support complaining about the slow responsiveness of the site, including the slow responsiveness of the commenting feature. Today they wrote back:
Errors like this are generally due to temporary problems with our servers, and if you wait a little while before trying again, Blogger should work normally. If you continue to have trouble with it, please try clearing your browser's cache and cookies before logging in again. We apologize for the inconvenience, and we are constantly working on making our servers more reliable.
Thanks for using Blogger!
Blogger Support Team
Is it just me, or do their severs have a lot of "temporary problems"?