Hi. Thanks for the reply.
I realized I ran into the problem of tagcloud inside a widget.
First I used the WordPress internal tagcloud widget and chose Browser-Tags to be shown in the cloud. And that uses the tag key/slug from NGG, which is ngg_tag and doesn’t yield valid pages. Moving to enabling shortcodes in widgets and using [tagcloud] in a text widget then creates the correct permalinks, kind of. Still some trouble with page ids, but essentially things work now.
Hi Stefano, care to share the solution? Because I have similar issues. I have a tagcloud which vreates links of the form “mywebsite.com/?ngg_tag=tagname” and when I follow the link I just get a “Sorry, not found” error page.
Thanks!