wrong bottom margin

[Sandor Szabo]

I updated MikTex2.7 and upgraded to LyX1.5.3 because of amsbook problems 
(thanks Paul A. Rubin) and almost everything is good.
The only problem is the missing page-bottom on dvi,ps,pdf, which means 
the last one or two lines are disappearing on the bottom of every page.
In case of amsarticle everything is ok. I tried to set the same layout, 
etc properties but didn't help.
Hopefully someone (maybe Paul) could help me.
Thanks.
            Sandor