IE6, in all its wonderful standards-compliant glory, was expanding the comment box to the entire screen as soon as anything was typed in it. Following the advice from this page, I wrapped the entire form in a 100% width div, and it seems to be working now.
Comments are still rather dodgy, btw. I don’t know whether it’s Akismet being over-zealous or a configuration issue1, but there’ll be delays on comments appearing as I manually check the spam folder 🙂 I’ve again emailed support, and hopefully they’ll be able to help.
- more likely the latter, given everybody else’s success with Akismet [↩]