[TYPO3] UTF-8 works for Firefox, NOT for Explorer

[Mark Pi]

UTF-8 is working for FireFox, but not --completely-- for Explorer.

Site has three languages, first two work correctly (English and 
Russian), but third has some missing characters (extensions to the 
Russian character set, but still part of the utf-8 standard) -- but only 
in Explorer. Firefox works fine.

To make things more confusing, the Explorer title-bar shows the correct 
encoding.

I checked the utf-8 troubleshooting page, checked that the page-encoding 
is set right in Explorer, and double-checked that I entered the 
characters properly in the first place.

The most confusing thing is that it works fine in Firefox (well... not 
really that confusing -- just frustrating!)

Any ideas?