Hi Peter,
yep the provider is just to be trashed (soon I'll be finally changing it).. sometimes opens quickly, sometimes doesn't load, but after refreshing there it is.. so at the moment it is working, just some patience is needed..
and well yeh it has been a weird road with the plugin, first I still don't know why, there were no links at all, I disabled everything, built again the categories, the categories group, the widgets, etc, and the links were there..
now the problem is that the widget doesn't appear at all in the single pages on the BLOG category.
Yes I'm using 2 widgets for each category group, and I asigned the category group BLOG to each blog post..
these are from the admin panel
Category Group assigned to the post:

Categories assigned to the post:

Widget

Thanks for replying and taking a look.. I'm very puzzled.. and of course the possibility to see the categories under the BLOG category is a core function I need in my page. I hope it can be solved..