Here the problem is that I have other exclude filters 
(e.g. -*newthread*) which should not be loaded even for 
forumid=69.

It seems as if something like *[6] works but not *[6]*

Don't know if this is a misinterpretation of me of the 
special wildcard *[6] or a bug when there is a * after such 
a special wildcard.
I didn't find any details on the matching process, even 
with loglevel=debug.