scrm

Thanks, that’s exactly what I was looking for. And it’s a much more elegant solution than having multiple index pages.

I solved the problem. Following your instructions, in wp_options, the ‘siteurl’ is https://scandal.org/wordpress whereas the ‘home’ is https://scandal.org/weblog . I’m using a different blog and wp directory (it’s actually just a remapping of one dir to another to keep things clean).
Following the instructions in this post I edited vars.php in the wp-includes directory, and am now able to log in successfully with either browser.
Hopefully the devs are aware of the issue already as the fix was posted back in May. Thanks for your help, Podz.

Yes, with both IE and Firefox. I’ve also deleted my cookies and temp files in both cases. The result is the same.