This started to happen to me yesterday as well. I started getting questions wrong and couldn't understand why, even after watching the videos. I decided that it really was a bad study day so I quit and went to bed. Tried again today and everything makes sense. You can do it!

Nope, the actual words were moving back and forth on the screen for me too. It hasn't happened before.

For anyone suddenly struggling when they reach these questions, don't worry! So did I! I went from breezing through the skill builders to getting completely stuck at this one. But I watched the next couple lessons, then went back and started at the Negating Sufficient lesson. By the time I returned to this skill builder, I got through them pretty easily. So don't give up!