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Whenever I exit out of full screen, FTB just gone black screen but I can still hear sounds, I can hear my self break blocks and I can interact with buttons but I don't know what i'm doing. PLZ HELP ME!
By full-screen do you mean F11? If so I believe that is still bugged even in vanilla. Check the console when you exit out of full-screen are there any errors? If you have Optifine try disabling it and see if you get the same blank screen.