wglUseFontBitmaps problem

Every time I run my prog at the beginning font is working nice. However as soon as I resize window or switch between worlds (in one I draw simple primitives, another uses texture lights…) font disappear (everything is working fine but font). I’ve created font based on NeHe tutorial. Any idea? What flags should be set and disabled in order to see font? I tried to play with this but it just going nowhere. Thanks.
PS: sometimes when I switch several time back and forth it might appear and then vanish again.

Maybe it’s a problem with raster position. Call glRasterPos()