Quite a while back "something changed" (grrr: sorry I don't know what) and I get the error "External entity html not found" when I try to edit XHTML text. It must have something to do with the DTD's, as DocBook still works fine. But I've spent a lot of time fishing around and can't find where the problem lies. This is getting annoying: any help appreciated!
Ahem, neeever mind! I've started rebuilding my environment from scratch and have gotten XHTML parsing to work, so there's something in the environment that I'll be able to fix (presumably). Figures I'd find it just after finally posting this.