Hello,
suddenly in every scene interaction with buttons and inputfields isn’t working anymore.
Even if I create a new scene with only a button in it, it still doesn’t work but creating a whole new project does.
Do you have an idea what caused this? Is there something in the unity setting that affects the whole project? 
You need to give us more info, code snippets related to the problem, screenshots etc
If you deleted your event system, that could do it.
thanks, but unfortunally thats not the case. It occurs in every scene of the project.
I wanted to know if there are global project settings for deactivating the UI in every scene.
I now ended up creating a new project and importing all the assets… this did it for me…
I don’t think there’s such a thing as disabling the UI in every scene.
At least you got a work-around. 
Can’t say I’ve heard of that before, sounds like a bad situation. heh.
Yes, there are a lot of threads with 500 different workarounds and solutions. None of them worked for me though.
hmmm 
thanks.
Have you checked to see that you have a Graphic Raycaster on your canvas?
Yes, I did and it was alright. And I think it would be unlikely that the raycaster disappears in every scene in the project.
That’s why i assume it was a strange bug