>>>> "Ilan" == Ilan Finci
<ifinci(a)myrealbox.com> writes: 
    Ilan> 1. If I do M-x set-face-font, select default face, and
    Ilan> change the size there, it affects only the buffer's text
    Ilan> (and it does work).
    Ilan> 2. If I then try to set the font size from the option menu -
    Ilan> all fonts changes size (tab name, mode line _and_ buffer's
    Ilan> text) - which is what is expected in the first place.
OK, if it's working like that, I have to figure it's something in your
environment.
1. Send us the output of xrdb -query.
2. Try with xemacs -no-autoloads.
    Ilan> 3. compiling on a powerPC (SuSE 7.1 distro) - I have the
    Ilan> same problem.
These are all SuSE boxes?  Have you asked SuSE?
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