OK, I made some changes to the phpBB code and lightbox works on IE9 now. There are dragons in that code -- all kinds of nasty workarounds for IE. Just more proof that IE has issues and a good reason to avoid it.
dsolodov wrote:Did you also review the code for all other browsers to be fair? What if the code for a browser X is even worse then the one for IE?
Yes, all the hacks I've found so far are for IE. The ones in the file I modified has to do with working around a serious security issue with the IE browser.