Note: this only happens on a specific household. Others load properly. However, it is no savegame problem, as I have already tried to use some savegames from a month ago, and the same household won't load.
This makes totally no sense as on the 11th of February I played seamlessly as everytime. I have even tried to go back until 20 of January savegame, but won't help. This household won't load.
According to DXDiag I had several crashes on msiddr something. I recognized the software and uninstalled it. Nothing changed.