Launcher will not restart if it has been closed, without restarting the computer

Put the summary of the bug you're having here

What I expected to happen was...:
clicking on the Minecraft launcher causes Minecraft to open.

What actually happened was...:
If I have played and closed Minecraft, nothing happens if I click on the launcher icon again.  I must restart the MacBook in order to open Minecraft launcher again.

Steps to Reproduce:
1. Open Minecraft.
2. Quit Minecraft.
3. Attempt to open Minecraft again.