ok ... it seems I get it working now, but only if I add

+*.htm +*.html 

in the filter box. I don't get it ... why ?!? 
Sholdn't html files be included naturally ???I mean this is the backbone of
website mirroring.
There are even some filters enabled by default (common image file formats,
e.g. jpg, gif, png, etc.) so why is html not included by default ?
Also, having read the document manual / help pages, it seems as if html files
were not even meant to be included in the filters as they are always included
by default. Maybe this doesn't hold true for "get separate files" mode, but
it's weird that in "download web site(s)" mode you must manually include
html!! How would you mirror a web site when disregarding html files ?!?
Anyway, it seems to work for me now, but I would nevertheless by very thankful
for some enlightenment here. 
Cheers