I'm having this issue too. I have tried EZVid, Bandicam, and Screencast-O-Matic but they are all black. Next I tried Debut, but it was incompatible with my Mac. :( I don't like using pirated software, so I try my best to avoid it.
I know somebody said to go into the window mode, but whenever I use the cheat fullscreen off, my screen starts flashing and tells me to press a button in 10 seconds to change modes. I press it and my screen keeps on flashing like a strobe light.
Just like the author, I am currently an unemployed teen who wants to record Sims Gameplay. I'll post if I find anything, but for now it's a mystery. :?: