Hello Ruebenwurzel and HGS.
Unfortunately, my site got too big for WB and I can't upgrade past 2.8.3, as it becomes incredibly slow. The site has more than 3,500+ pages and it seems that every time a page is generated, WB needs to "read" the whole database to generate the "showmenus", causing this speed issue (if I remove the menus, the pages are generated very fast).
This has caused in part that my site lose positions in the search engines, going from an average of 10,000 daily visits to 1,500 daily visits.
So, as much as I have loved WB for the past 10 years, and without a solution for this (and unable to move to newer versions of PHP as WB 2.8.3 only works yo to version 5.6), I decided to change CMS. My plan is to install Wordpress in the root folder of my server, and move WB inside the "pages" directory while I change little by little the different categories of my site.
I want to leave the current URLs as they are, so as to not lose the good search engine positionings that I still have. And I will create the Wordpress pages with the same URLs as the ones from WB.
It will take me many months to move the 3500+ pages from WB to WP, but at least this way I can change the categories little by little and hopefully see the benefits more rapidly.
Crnogorac was very kind helping me yesterday on one a copy of my site, and he still has some good ideas to try.
But I created a new copy just in case, so if you have any suggestions to do this please share them.