debugging Xlib: Maximum number of clients reached

[Rich]

hi. i have searched all over the web, tried asking in #xorg and other
related channels - but have failed to find the answers.  hopefully i
could get some hints here.

now and then i am getting errors :
Xlib: Maximum number of clients reached
whenever i try to launch some application with a gui. i suspect several
applications i am using, but i would like to know how can i surely find
out which one is leaking.
i have tried running xrestop (0.4), but i was unable to find any
reasonable information on what should i look at.

if i can find out the cause by using xrestop, what should i look for ?
is "Wins" column any indicator ? what are normal values for applications
to have in this column ? (xrestop manpage is extremely vague regarding
it's output).

if it's not xrestop, what other tools could i use to find out what
causes this problem ?

thanks.
-- 
  Rich