This has happened recently. When i go to change the version, forge, or even other options nothing shows up but a blank screen shown in the screen shot below. I also can press buttons through this screen. I dont understand why I cant change the version. I can't play any other version other than the ones i made before the problem occured. I have 1.7.10, 5.4, 10.2 (The last version until the problem occured), and 12.0.

The especially upsets me because i cant play the newest version...

Thank you for reading this! Please tell me what I can do, or fix the bug.