I have heard of and experienced a problem that might be the one you're having. Do you use Discord? If so, it may be a problem with discord overlay conflicting with the game, most people who have this issue can fix it by going to settings, and finding Overlay in the app settings section on the left side, then just turning off "Enable in-game overlay." If that's not it or you don't use discord, I'm not sure what else it could be. Hope you can fix it!
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