Unable To Highlight Worlds In singleplayer

When I launch minecraft, everything works normally. I can go to singleplayer, start a new world, play as normal, etc. Whenever I save the world and exit the game, I try to open the game back up and load a singleplayer world, which appears in the list as normal, but when I try clicking on the world, it does not highlight, therefore I'm unable to select a world. It also seems to apply to the scroll bar in the controls tab of the options menu.