Krita crashes constantly. However, I made a new pixel preset and now it's gotten even worse. It opens like usual, but as soon as I click "create" to make a new file, it crashes.

Can you please follow this instruction: https://docs.krita.org/en/reference_man ... ugger.html to get us more information so we can understand why your Krita crashes?

Also what OS are you on? Which Krita version do you have?