After some investigation, we've realized that our two new webservers are having a problem with the OpenID modules installed on them. (For those who care about that sort of thing: it's a case of version incompatability; newer versions of the OpenID modules require (without telling us that they require, ugh) a more up-to-date version of the JSON modules than we have installed or have tested against. So, we have to do some regression testing before we can just upgrade.)

So, for at least the next few days, you might notice that the option for commenting as an OpenID account doesn't appear sometimes when you load a comment form, or if you're logged into an OpenID account you might randomly get weird errors or seem to be logged out, etc. If that happens, just refresh the page until the problem clears up. (When you ask for a page, you get sent to the webserver that's next up, so about 1/4th of the time you'll get one of the webservers with the problem.)

We'll have this fixed as soon as possible! Sorry about the trouble.