Cue the music, please. This is a repeatable error -- a fatal flaw, in fact -- with lyx-1.6.1 on Slackware-12.1.
Open existing document. Select from menu Insert -> Insert File -> Plain text join lines (or just Plain text). Instant crash; lyx shuts down. Invoking from the command line with the -dbg switch tells me only what features can be debugged, it doesn't run the application in a debugger. Rich -- Richard B. Shepard, Ph.D. | Integrity Credibility Applied Ecosystem Services, Inc. | Innovation <http://www.appl-ecosys.com> Voice: 503-667-4517 Fax: 503-667-8863