Can't add frames as it dissappear only

I am about to work on my project when suddenly I can’t add frames to start designing, it just dissappears.

Also, when I click on an existing project file, a pop-up appears telling if i should delete it instead of continuing working on it and when i tried to click the back button to dismiss it, it won’t listen. Is there a glitch or problem right now or its just in my part?

Thanks for your responses.

can you record a video of all these behaviors? sounds very strange, maybe your delete key on the keyboard is stuck or something?

thanks man, now working properly.