uname -a
NetBSD IANZAG 2.0_BETA NetBSD 2.0_BETA (IANZAG) #0: Fri May  7 17:55:29 NOVST 
2004  toor@IANZAG:/sys/arch/i386/compile/IANZAG i386
Qt3: qt3-3.3.2

When LyX exits the following is printed and core dumped:

---cut---
lyx: Error detected by libpthread: Destroying locked mutex.
Detected by file "/usr/src/lib/libpthread/pthread_mutex.c", line 135, function 
"pthread_mutex_destroy".
See pthread(3) for information.
Abort trap (core dumped)
---cut---

Not sure but looks like it's LyX or Qt3's problem. Cannot say it makes me much 
of troubles, just booring to delete lyx.core from home time to time :)

// wbr