When I try to open Minecraft.app, it doesn't "bounce," or anything like that, and the launcher doesn't open (I attached a video of me trying to open it).
In Terminal, I opened /Applications/Minecraft.app/Contents/MacOS,
then ran ./launcher. It opened the launcher fine through this method.
I've also tried restarting my computer a few times. The launcher opens fine using the normal method the first/second time, but after that, it doesn't work anymore until the computer restarts again.
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This happens to me too. (macOS), Activity Monitor shows that the Launcher continues to run and consumes CPU time even after the main app launches. It stops being responsive when the main app quits, so trying to launch again doesn't work. The remedy I'm using is tor force-quit the launcher thru Activity Monitor, but I have to do that each and every time (after the first launch).
Still a problem with Launcher version 933(1) under macOS 10.13.6 High Sierra.
The problem seems not to occur after short game sessions. (Under an hour? But who plays Minecraft for under an hour?)
Specifically, the problem is that if you launch the game, play long enough, and then quit, the game itself (java) quits, but the launcher ("Minecraft Launcher" in Activity Monitor, but its real name seems to be "launcher") continues to run. If you try to run it again by clicking on its Dock icon, the OS sees that it's still running and sends it an 'open' event, without bouncing the dock icon. The launcher is not accepting Apple events, so it is now classified as "Application not responding". You can't simply quit the launcher, because it won't accept the 'quit' Apple event either. You have to force quit it, either in Activity Monitor, or by issuing the command 'killall launcher' in Terminal.
This has happened to me too and the only way for me to temporarily fix it is to force quit Minecraft via activity monitor and/or restart your computer. Also, yeah the command in terminal works too.