Let's see. I think it may
have something to do with the three choices for editor settings
User CP > Settings & Options > Edit Options > Miscellaneous Options > Standard Editor - Extra Formatting Controls
...(for both Opera and IE this
option gets you "smiley availability" in the post reply boxes in "Advanced" but not
in "Quick Reply")
User CP > Settings & Options > Edit Options > Miscellaneous Options > WYSIWYG
...(this gets you a bona fide live-post simulation with live smilies in the post reply boxes in "Advanced" but not
in "Quick Reply" in IE) (This WYSIWYG editor doesn't seem to function correctly in Opera??)
"Basic Editor" is basically just a posting box with no options or smilies at all in either browser?!
YMMV! ...and to make it worse -- I'm such a yutz that I'm not even sure this is what you're talking about, anyway?!
Think I'll go get another brewski outta the fridge...