Math symbols disapeared

[Renaud MICHEL]

Hi

Two month ago I upgraded my Mandrake 7.2 to 8.0 but didn't used LyX til now 
and I saw that I have a problem : I don't see anymore the math symbols or 
greek letters.
With mdk 7.2 I had XFree86 4.0.1, with mdk 8.0 it was upgraded to 4.0.3, I 
upgraded to 4.1.0 and LyX 1.1.6fix3 with no success.
I guess it is a font problem, but where should I look for?
Any idea?

-- 
Etre un iguane,
ce n'est pas fossile.

Renaud MICHEL