Because of all the problems people who, for whatever reason, are still stuck using IE are having, for now I'm changing the forum's defaut theme back to the SMF default. Anyone who does not use IE and who has been enjoying the Lightning theme can go back to using it by following my instructions in reply #97 but, of course, picking the Lightning theme instead. However, I would strongly suggest that people who are still using IE give serious consideration to forgoing it in favor of Firefox. It's by far an infinitely better browser - and not just because its developers have the good sense to make it compliant with the internationally recognized/supported W3C standards - it offers many other advantages.
For those who are stuck with IE, the good news is that I have some other themes in the works that will work better with IE. The bad news, though, is they're nowhere near ready to install. However, SMF offers several alternative themes on their Web site. I'm going to go see what I can find over there that's suitable for DS and that will work with IE, and I'm going to install one so that IE users will at least have an alternative to the SMF default for the time being until a more DS approriate theme is available.