My Art Program is Acting Up...

I don't know what I'm doing wrong, but Krita has decided that it doesn't want to work for me. For some reason, out of the blue, it decided that it was not going to recognize the pressure sensitivity on my tablet. So now every line that I make is constant, and does not go from thin to thick. So the art I made on it does not look right...and I have commishes I really need to finish.   

The pressure sensitivy works on GIMP, but not on Krita. Normally when this happens, I have to just reinstall the tablet driver and then it works fine. Buuuut...I've reinstalled my tablet driver three times, reinstalled Krita three times. And it still doesn't work...  

Anybody have any tips? 

Why now Krita? Just...why? _{I don't wanna go back to using GIMP....}