No problem, Roger. Getting a sample epub that will exhibit the issue would be extremely helpful as well. If you have an epub that calibre will allow you to edit that Sigil absolutely cannot open (I mean
can't here, mind you, not "opens after errors/warnings"), then of course we will want to remedy that, if possible. All I'm saying is that the well-formed html issue you described (wrong closing tag), wouldn't be enough to make that happen. The tolerance for that kind of parsing error, that you were requesting, is already present. Whether there's a different kind of issue Sigil should be more tolerant of is yet to be determined.
Apologies for "snapping" at you, but you have to admit that you didn't really present this in a typical bug-report kind-of-way.
