"No item selected" shown when i click elements in outline
I have a problem that just started today and I cannot figure out why. For some reason, about 40% of my elements (folders, images, text, etc) show "no item selected" in the properties box when I click it in the outline box. I cannot edit any of those elements. When I right click them, nothing happens. When I left click them, it highlights as if selecting what I just clicked, but again "no item selected" shows in the properties box, as if nothing were selected, even though I just selected them in the outline box. Please tell me there's a way to fix this.