[Zope] external editor woes

[xn]

Hello all,

I seem to be having this error in trying to use the external editor:

++
If you are using IE and you receive an error from the helper app like
"FATAL ERROR [Errno 2] No such file or directory...." it means that IE is
refusing to save the temp file to disk. This is usually caused by a cache
control header such as "Cache-Control: no-cache". To use external editor
with IE you must prevent this header from being set. Some versions of
CookieCrumber inject this header for all authenticated requests. You can
fix this by changing the CC configuration on its properties tab in the ZMI
to use another cache control value such as "private".
++

I can't seem to find the place to change it specifically. Can someone hold
my hand on this one and point me to the right spot? All/any help would be
most appreciated. Thanks.

N.B., I don't know if this adds any info, but i just tried to use the
external editor via zope.org to edit my "frontpage" and i get the same
error. Hurm. Maybe it is not my installation at all...

Thanks,
Christian