We need more information to find out the cause of this issue. To those who are currently affected by the issue, please navigate to the Minecraft data folder (how-to) and then please attach launcher_log.txt.
You may try to fix the issue by deleting the versions folder in the Minecraft data folder and restarting the launcher. If that did not help, then you can try fully reinstalling Minecraft.
Everytime I try to make a new config in the new 2017 launcher,everything works. Except the versions. I try to click it and it just highlights the box,and does nothing else! I will attach a screenshot. Plus,my brother uses the same account and type of Macbook I have...I don't know if it's my problem,or the launchers.