I think it's more or also related to default and non-default skins (in combination with very high detail).
I've set my Sim details to very high since.... well more than a year ago and I don't have these problems with my Simmies in CAS nor in game.
However since I started to use and downloaded Sims with non-default skins I sometimes do have the same problem in CAS as you guys. But it's always with non-default skins and NOT with default skins....
The plot thickens...
Groetjes, Cheers, Gruessen,