Hey, I just wanted to post this before I forget in case somebody needs to see it. I was having a problem sometimes where I couldn’t select logic bricks across different objects (like I couldn’t select object A and B, and add logic bricks to both of them). This made cross-object logic, like having a collision object to check for the Player, impossible. The solution was to select the “Lock Camera and Layers” button. It’s in the 3D view and looks like layers of squares with a chain next to it.
Anyway, just wanted to post that.