Re: Problem with edge scrolling...

I'm right clicking, dragging the camera, then releasing; not just clicking. Those are some good ideas. My mouse may even need a new battery. 

For anyone following this, you can also move the camera by double-clicking on your individual Sim's icon at the bottom of the screen.

Edit: I changed my mouse battery, but that didn't do anything.

Edit: Changing from the Sims 3 camera to the Sims 4 camera and back to the Sims 3 one sort of worked. I still think it's kind of glitchy, unforutently.