Premiere Pro's functions are not working.

The more I use the app, the more problems I encounter. At first I couldn't color grade any clips, still can't, it doesn't show up or change in the slightest even if I render it. Now I can't even do basic effects like blur. The effect doesn't show up, like all the other effects I've struggled with, rendering doesn't change anything, starting a new project doesn't, uninstalling and reinstalling Premiere doesn't either.