I just finished creating a custom theme for a client's WordPress installation, by modifying an existing theme, and sent him the link to view it on a test site, only to find that what he was seeing was not the custom theme I'd created, but the original theme I based it on (equiX).
It wasn't a browser cache issue, because he hadn't looked at the site before. With a bit of experimentation, I found that it's loading the custom theme when viewed in Firefox, but the unaltered equiX theme when viewed in IE.
Does anyone have any idea why this would be happening? I'm going to go through the template and stylesheet and see if I can find anything, but I was wondering if anyone had encountered that before.