Hope someone can help me with this issue:
I had set the following permalink structure: /%pagename%, which worked fine, also with subpages, as the url-bar correctly displayed pagename/subpagename. However, the single posts could not be viewed; clicking on a posttitle in a (static) postpage (you know, all the posts displayed ordered by date of publishing) displayed the 404 error page. I then changed the permalink to /%pagename%/%postname%, which fixed the problem of the posts - single posts were now viewable, but then the page with subpages generated a 404 error page..
Hence, my question is: Which permalinks structure or syntax is correct when I want to display single posts AND pages with subpages?
For the record: everything works fine when I set the permalinks to default or 'ugly' structure or syntax.