I believe that my clients are loading properly as both vanilla and modded(Direwolf20) clients work properly in terms of launching and joining servers(even clicking on the server names), but do not allow me to select, click on, or interact with the GUI for the world selection hit-boxes. I am able to click the buttons on the bottom of the screen labelled create new world etc, but not the world names themselves. Since it seems to be a GUI problem I'm being led to believe that it involves an error with Windows 8.1 not allowing selection properly. I should also mention that I was previously able to access the world and select/click on them perfectly fine before, although I cannot remember the point at which this error began.
Thanks for the help in advance
EDIT: From the posts with other (not exactly the same) errors I have read, there have been suggestions to switch between fullscreen and windowed and check selection but this has had no effect so far.