lyx SIGSEGV font problem

[Alexander Helmut Jarosch <Alexander.Jarosch@uibk.ac.at>]

to everybody a big hello and maybe someone can help. 

I run a debian woody and I updated to the X86FREE 2.4.1 

if I try to run the standard lyx from the debian package 1.1.6fix4 it 
crashs with the following output 

****CreateWin OK**** sleeping 1 seconds 
waiting Event(19,w=0x1800099 s=992) MapNotify 
waiting Event(12,w=0x1800099 s=992) Expose count=0 serial=3e0 
In EventCallback [events.c 34] Unknown window=0x1800099 
Ignored Event(12,w=0x1800099 s=992) Expose count=0 serial=3e0 
In FormPixmap [xsupport.c 345] creating(w=420 h=290) 
In FormPixmap [xsupport.c 365] Creation Done 
In SetFont [fonts.c 276] can't load 
-*-helvetica-bold-r-*-*-*-120-*-*-p-*-*-* 

lyx: SIGSEGV signal caught 
Sorry, you have found a bug in LyX. If possible, please read 'Known 
bugs' 
under the Help menu and then send us a full bug report. Thanks! 
Bye. 
Aborted 

I think its a problem with the xfs server. 

when I run the program 

xlsfonts -fn  -*-helvetica-bold-r-*-*-*-120-*-*-p-*-*-* 

I get alot of fonts, so I am a bit confused. 

the problem also occurs when I try to run mathematica 4.2. It also 
complains about not finding a helvetica font. 

if anybody can give me some advice I would be more than happy. 

thanks in advance.