As noted in the image below, the background coloration setting for Internet explorer has escaped me. I've found the IE setting for the background color for the main editor box (here) in the editor_ie.css file in the curve theme. I'm using a modified yaBB 2.0. I've looked at both dropdown css files in Curve and don't see where this setting is. Any help is, as always, greatly appreciated.
(https://www.simplemachines.org/community/proxy.php?request=http%3A%2F%2Fimg51.imageshack.us%2Fimg51%2F1081%2Fiedropdown.gif&hash=a5d10f2c3425bbc1208a3f0396ff69ef5c76115c)
That's not a drop menu as such. It's part of a select. Do a search for those. You can even get the class or id for that one either from the template or directly from the screen via web dev tools.