Updated my graphic card driver 2 days ago, I believe that it was the latest.
Tried opening the Launcher today, and the problem was solved by itself. I don’t know why but all problems are gone and the app (Launcher + Editor, notifications) work as it is. Maybe because of Launcher’s self update, idk.
Fyi, this problem was solved even before I tried to verify my current engine (4.8.2).
Thank you, Sam!