As some might have noticed GMail was updated this morning. As usual this broke the standard view Konqueror, but only if you use the recommended method of spoofing as Firefox.
Fortunately I traced it down and fixed it in no time at all :D
Here is the patch for your convenience (apply in kdelibs/khtml):
void HTMLElementImpl::setInnerHTML( const DOMString &html, int &exceptioncode )