I don't have a good traceback for this. I just opened a LyX file, did a Find, hit the Find Next button a few times, and it crashed.
I have this on the console: $ lyx fsmon.lyx text not available! no text in cache! dont like 1, pos: 908 size: 28 dont like 1, pos: 50529027 size: 12 dont like 1, pos: 1634234476 size: 62 dont like 1, pos: 400 size: 351 dont like 1, pos: 1690 size: 746 Assertion triggered in std::_List_iterator<Paragraph, Paragraph&, Paragraph*> Ly XText::getPar(int) const by failing check "par >= 0" in file ../../lyx/src/text. C:1983 Aborted (core dumped) -- Kayvan A. Sylvan | Proud husband of | Father to my kids: Sylvan Associates, Inc. | Laura Isabella Sylvan | Katherine Yelena (8/8/89) http://sylvan.com/~kayvan | "crown of her husband" | Robin Gregory (2/28/92)