I am study Java by reading "Objects First With Java." On the BlueJ IDE, I try to right click a class to create a new object and nothing pops up like it used to. What is wrong?

Recently I have noticed this and other odd things occurring. I think I must have altered some setting by accident.

Also, when I try to open a new project by clicking on Project on the menu bar, when I move down to Open Project, the mouse cursor does not appear over Open Project. I release the mouse button and then the drop down menu disappears. What is causing this?