Just uploaded a script error generated by MC and not sure if it is related to this issue I am experiencing:
Sometimes, when rotating many households in a short period of time the Portrait Panel does not always reflect the household I've switched to and/or I can only select one sim. In addition all the tags in the world go missing. Restarting the game corrects the problem. Is this what MC is fussing about?
Thanks.

Doesn't appear to be related as it's a CAS error. That looks like the one caused by attempting to load a category with no valid parts.

Thank you Chain. I was changing CAS settings and probably caused this.