OOPS! I figured it out. Stupid mistake. I had the other layers unchecked but I did not have the layer I wanted to work on selected. It was checked in the box but not selected (so it was highlighted in blue.)
I spent a lot of time searching so I apologize if this has already been covered, I can't find it.
I'm stuck at the most basic thing. I'm sure I'm doing something dumb but I can't figure it out. I'm on one layer, all others unchecked.
I draw a selection box around an area.
I click 'Move selected Pixels'
I drag it somewhere but only the dotted line box moves, not the image I selected.
I also tried the selection 'Move Selection' ... the box is blue-highlighted, I drag it and, again, only the box moves, not the image.
I also tried copy, then 'paste into a new layer'... it created a new layer created but again, the box shows up there but not the image.
Help! 🙂