[XeTeX] tabular getting flattened into one line

[Cyril]

I'm having a bit of a problem with some tables at the end of a  
document that get squished into one line. If I typeset the tabular  
element on its own in LaTeX it works, and gives me more or less what  
I want, but it does not want to cooperate in the bigger document with  
XeLaTex.
I finally [while running last tests  when writing this email] found  
that it was linked to this:

%underfullbox vbox
% http://www.tug.org/pipermail/xetex/2005-March/001900.html
\lineskiplimit=-1000pt
\renewcommand\baselinestretch{1.9}
\raggedbottom

which I was using to get rid of those messages:
Underfull \vbox (badness 10000) has occurred while \output is active  
[316]
of which I have one for each page almost.
Commenting them out gives me the tables alright though...
Why are these things linked?

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