Problems with lyx in greek mode

Hi erverbody, 

I use SuSE 8.2 and the attached LyX version.
All works fine, but: 

if I want to write a greek  letter, 
\gamma for instance, its LaTeX command is written on the screen
als ERT, but not the corresponding symbol. Nevertheless LeTeX itself
works fine and produces an ordinary gamma.

All available fonts were installed and I can find the corresponding
links in the LyX config directory.

The debug mode produces something like 
"can't find FONTNAME"
"cannot fake it"

where FONTNAME is an alias for the fonts LyX didn't find.

Can you help me?
Thanks a lot, 
greetings, Thorsten                

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