I have this issue too, it appears that the Minecraft Launcher process is still running after closing the game, so you can't open the launcher again (as it is already running).
[media]
A temporary fix is to open Activity Monitor, and quit/force quit the Minecraft Launcher process so you can launch Minecraft Launcher again.
I have this problem too, really annoying considering any official release below 1.13 works fine.
It also seems like with some newer versions there's a bug with the player's view teleporting after exiting out of the inventory if you move your mouse in the inventory...
I have this issue too, it appears that the Minecraft Launcher process is still running after closing the game, so you can't open the launcher again (as it is already running).
[media]A temporary fix is to open Activity Monitor, and quit/force quit the Minecraft Launcher process so you can launch Minecraft Launcher again.