Hello smellos. You may have noticed that commenting has been messy lately. But thanks to some intrepid bug-reporting readers, we think we may have narrowed down the problem. The solution is a bit tricky for now, so obviously it's not ideal. But we're working on making it easier for you.
For now, if you're getting a "Server Configuration Error" when you try to post, it probably means that you need to delete your SFist and TypeKey cookies. You can do that in Firefox by going into your preferences, clicking on "Privacy," then clicking "show cookies." From there, search for cookies that have the text "ist.com" (if you have cookies from any of the other -ist sites, they'll need to be deleted too, since they're having the same problems). Delete those, and also any cookies from TypeKey. Then try commenting again.
The process is nearly identical in Safari.
In Internet Explorer, you can delete your cookies by rebooting, downloading the most current DLLs, renaming each one four times, rebooting, searching the registry for the name of your mother's high school sweetheart, setting your monitor on a 37-degree incline, rebooting, and then confessing your darkest fears to a man with a fu manchu mustache. You may also need to reboot again.
A screengrab of cookie-deletion in Firefox follows after the jump. And please, let us know how this process works out for you: sfistbugreport - @t - gmail - dot - com. We're terribly sorry about how difficult this is. We're working on making it all better.