I love this one. It's even better than Caps Lock making the cursor into a single point.
So if I am on the right track, you have a 1 in the size settings on your option bar. It happens when your fingers move faster than your brain, and we have all been there after using PS for a while.
Hello, In order to get help quickly, please post the contents of Photoshop's help>system info... This will give your platform (Mac/PC), its version, the version and update status of Photoshop, informations about the graphic card and plug-ins. Remember that the folks helping you might have a great knowledge of computers, but if you did not give a minimum of informations, they won't be able to help you.
Did you look at the settings of the crop tool? Did you try to reset the tool by right-clicking on the leftmost icon of the Option Bar, and selecting "reset tool"?