Normally the selection box is blue and disappears when you click away from it. I had sent my 2D design to Layout. I was working in Layout then at some point and I don’t know how, the blue select box had a solid black line around it which covered my design and if a tried to to delete it, it would delete my design. If I clicked away somewhere else the black outline box would remain. Eventually I found that if I right clicked on the black outlined box and pressed explode the box would disappear. But then the select tool was not working after that I could not do such things as change the scale in the trays on the right side (the tray was there but would not let me click on anything because I guess nothing was selected. Luckily I was almost done at this point so I could just print it off and hand in the assignment, but to tweak anything in the trays I had to start over it seemed.
Any idea what happened or how I can solve this if it happens again? Thanks