Hi JMarc, All, here is a backtrace of the LyX crashes on the mentioned system ( using egcs-1.1.1 and Linux-2.2.0pre7 ). This only happens when optimization is turned on, so it might well be an optimizer bug :-) I will try to look into some more, if you have any ideas, please let me know. (gdb) run Starting program: /usr/src/lyx/lyx-1_0_x/src/lyx Program received signal SIGSEGV, Segmentation fault. MathParInset::Metrics (this=0x120458f50) at math_draw.C:172 172 p->SetStyle(size); (gdb) bt #0 MathParInset::Metrics (this=0x120458f50) at math_draw.C:172 #1 0x120105190 in InsetFormula::Read (this=0x12045fd00, lex=@0x11fffe6b0) at formula.C:385 #2 0x12012e8d8 in Buffer::readLyXformat2 (this=0x120456720, lex=@0x11fffe6b0, par=0x120460d90) at buffer.C:892 #3 0x1201343f0 in Buffer::readFile (this=0x120456720, lex=@0x11fffe6b0, par=0x0) at buffer.C:1138 #4 0x1201b35b0 in BufferList::readFile (this=0x120361228, s=@0x11fffef60, ronly=4831831728) at bufferlist.C:524 #5 0x1201b5800 in BufferList::loadLyXFile (this=0x120361228, filename=@0x11ffff2b8, tolastfiles=true) at bufferlist.C:643 #6 0x1200c736c in Menus::ShowFileMenu2 (ob=0x1203cdb40) at menus.C:691 #7 0x20000147888 in fl_object_qread () #8 0x2000015be8c in fl_check_forms () #9 0x120018a78 in LyXGUI::runTime (this=0x11ffff5a0) at lyx_gui.C:629 #10 0x1200087f4 in LyX::LyX (this=0x11ffff8c8, argc=0x11ffff8c0, argv=0x11ffff988) at ../src/lyx_main.C:119 #11 0x120007d18 in main (argc=1, argv=0x11ffff988) at ../src/main.C:51 Greetings, Jochen ----------------------------------------------------------------------- Jochen K"upper Heinrich-Heine-Universit"at D"usseldorf [EMAIL PROTECTED] Institut f"ur Physikalische Chemie I Universit"atsstr. 1, Geb 26.43 Raum 02.29 phone ++49-211-8113681 40225 D"usseldorf fax ++49-211-8115195 Germany http://www-public.rz.uni-duesseldorf.de/~jochen -----------------------------------------------------------------------