symbol missing in lyx window

[Remzi Seker]

Lyx 1.1.6fix1, on Mandrake 8.0 does not show some math symbols in the 
document. Same thing happens in the math panel too. Some of the menus in the 
math panel are empty. 

The symbols look okay in the dvi file though. 

Any idea what may be the matter?

Remzi