OK, seems I should give some more informations: I use a recent woody with XFree 3.3.6-11 and LyX 1.1.4-7, X server is SVGA (window manager: sawfish-gnome 0.31.1-2 on the newest Debian-only Gnome -- not the Helix distribution). Hardware: a Matrox card MGA G400 AGP with 16 MB RAM, the monitor is a fairly expensive Nokia 447PRO.
The same thing happens on another PC with a Matrox Millenium 8 MB and an EIZO F56 (same software versions). As previously said, LyX is basically working, it only crashes and gets me out of X when it loads many fonts in the X server. Hoping for help, joachim