I've been plundering around the Sims3-related parts of the internet to find information about this.
It turns out that a LOT of people have been experiencing their sims turning invisible, sometimes followed by missing interface too.
As far as I can see, no solutions have been found as of yet. Some people gets out of the trouble with resetsim, some with the use of various ... mods (deleted) and some are lucky enough to get around it with the use of backup saves.
Well - nothing of that works for me, and a I know I'm not the only one who had to abandon a dear beloved savegame b/c of this.
I can see that theres at least two topics here on Carls and Pams forum, one with no solution and one that fixed itself.
I now create this thread to try and gather all the information again and see if theres any news on this topic?
Did it get fixed with generations by chance?
Sincerely
Mialovescoffee