loss of character "s" in x

[Markus Uhlmann <markus.uhlmann@ciemat.es>]

i am running sarge on a dell latitude 5100. window-manager is
"wmaker". 

frequently the "s" key ceases to work under x (no hardware problem,
works in text consoles) and can only be re-activated by ctrl-alt-f'ing
to a different console and back to x. 

the problem might be triggered by pressing "ctrl-x ctrl-s" in emacs,
which i do often, but i am not sure.

anyone has a similar problem? or even an explanation? it started after
a recent "big" up-date around 10 days ago. sorry, don't know which
packages were updated, but surely x-window-system was part of it. 

thanks.