some more checking results:
1. If I do M-x set-face-font, select default face, and change the size
there, it affects only the buffer's text (and it does work).
2. If I then try to set the font size from the option menu - all fonts
changes size (tab name, mode line _and_ buffer's text) - which is what
is expected in the first place.
3. compiling on a powerPC (SuSE 7.1 distro) - I have the same problem.
Is there any way I can help debug it? (trace functions or something like
that? I never did it before, but willing to try).
bye.
Ilan