Thank you for your help. I am running the last beta version of LB. Yes, the older version seems to be incompatible with the current one.
About your plugin' current version; It works! Even though it only gives 10 games lists instead of the older 20, (Is there a way to change this or changing it can cause incompatibilities?) and only seem to generate a new playlist when I start BigBox (maybe because the plugin that comes with the theme is the theme's subfolder and it activates the launchbox plugin?).
It's an awesome plugin. With this, I will have a few good casual random gaming sessions with bigbox.
Thank you!!