I reinstalled my whole game - the Science career not only has no co-workers - half the tasks can no longer be done either. For one the plants do not work right at the science center. Aliens never appear either so you cannot do any task related to alien tourists either. The task to do things to the shaggy grass won't even queue up - it is as if the game no longer knows what that grass is. The science career is a night mare. The only pack I do not have is GF. I do not use mods, CC or cheats ever and I run a high end gaming desktop with 8 cores and 16 gigs of gaming ram.
I played this career all the time up until a week before the GF patches and it worked perfectly - now it will not work at all even on a totally reinstalled game. It's on your end. I am always connected to Origin and allow origin to see my game - check it for your self. I have 2 saves - I started one three days ago and the new one today - and same thing. The career is broke. It's my sims career of choice and since GF - now I can't play it? This is Bull!