If you’re ever having trouble getting your Logitech MK520 keyboard to work properly, it might be because the keycaps are not resetting properly. Here’s how to do it:

  1. Open the keyboard’s Properties window and click on the Reset button.
  2. In the Reset dialog, enter the following information into the Keyboard Name field and click on the Reset button: Logitech MK520 Keyboard - Default Settings
  3. Click on OK to close the Properties window and then restart your computer.