Cursor menus -- how to get rid of...

Every so often my mouse cursor changes. Instead of the standard arrow, there's an arrow with a tiny box (menu box) next to it. When the cursor is in this state, I cannot click on anything to perform typical functions. When I click on something with the cursor in this state, a menu item shows up. It's very much like the 'right mouse click' function on PCs. How did I turn this on and how do I get rid of it?

hmmm that happens when you hold down the ctrl button but its wierd that it happens automatically. If the box comes up again see what happens if you hold ctrl and click

check your ctrl button. seems to me its somehow pressed down all time. problem should be in your keyboard

Maybe he's leaning on it. I do that sometimes.