Indefinite loadingscreen is back and other funny happenings

Okay, I updated my game with the parenthood pack. Loads beautifully, everything works in CAS, I can create a sim, no problem. At this stage I run a completely new Game, no mods, nothing. Completely Vanilla. I try to load my test sim, result is indefinite loading screen. Use Task manager  to close game. Restart game and load, everything runs smoothly. I enter the Game ( saved Games ) and there she is, living in the house I moved her into. Now I go into build mode and can enter her house, change and chop, buy furniture, sell furniture, everything works.
I go back into world and try to play with this sim. the game loads for a short while and then jumps back to the world map. (all worlds are there)
I try to play a different family, same thing happens. ( originally the plumbobs are all greyed out, when attempt to play the game loads aaaaand jumps to world map. Now I return to the world I wanted to play and the plumbob of the family has turned to green and its considered as a played household. In the saved games they also appear as a saved game. Totally weird. Trying to load those saved games results in the same scenario. So those in the know, is it possible to create another fix like the one for vampires and Toddlers update?
Trying to use that fix in parenthood does not work, it results in the error the saved games was created by a newer version of sims 4 try to update via Origin, etc. This is understandable.

I will now revert back to Toddlers and Vampires.

Did you try renaming the sims 4 file in documents to sims 4_ and allowing the game to create a new one.

Believe me, I did. I always do before actually using my old game file in Documents. Just to test if it works. Always completely new and completely vanilla. I even move save file, tray and mods out of the old game to the desktop before installing a new game pack.