Weird. Wort testing certainly. I'm on vacation at this time - until the end of August, but when I get back, I'll see about taking a closer look. Umm, BTW., what version of IE? Just asking as according to the supported platforms doc:
Internet Explorer 8 and 9 is supported for Standard (Strict) and Compatibility modes.
Internet Explorer 10 is supported in Compatibility Mode when <doctype> is set to "html"
- Ludek