Premiere Pro is not allowing any objects (I have tried titles, video and audio) to the timeline. When I drag it over, it comes up with a closed hand with a crossed circle. I already have media, but now I can't add any more. No layers are locked. I haven't changed any options. Help? Me and my teacher could not figure it out.
Where premiere allows you to drop or insert clip depends on on Source patching and Track targeting. Basically, you can only drop clips into a track that has Source patching turned on in the track header.
You also cannot drop clips onto tracks that are Locked
This video explains these features in more detail:
It's not a solution, but rather a workaround. I created a new sequence and dragged the existing sequence into the new one. I can't say why the other one doesn't work, I have no idea.