This is a new MacBook running Sierra, and I downloaded LightRoom and Photoshop. Everything is the current versions in Sierra and CC. In both software, the cursor won't respond except in uneven, slow, jumpy movements. I can't use it. How do I fix this? I haven't had this problem before. Thanks.
I figured it out. I remembered that the guy who migrated my data and set up my new laptop mentioned that he made the cursor larger to make it easier to work with. I started wondering if that could be the cause of the problem. I changed the cursor back to "normal", and now the cursor works in Photoshop and Lightroom.