Put the summary of the bug you're having here
Updated Launcher (which was working a few hours ago) has now stopped working, after a forced update "adding runtime". The Launcher hangs in "preparing" after clicking on "play" but the game will not launch.
What I expected to happen was:
Minecraft Game to start after clicking on "Play".
What actually happened was:
Launcher hangs and the bar at the bottom says "Preparing", but nothing happens.
Steps to Reproduce:
1. Open Minecraft
2. Wait for Launcher to load
3. Click on "Play"
4. Wait forever and be very frustrated!
Please help!
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Yes! This is definitely an annoying issue, I hope this gets resolved soon. Mac OS X 10.11.6 El Capitan

same here...is this the Microsoft influence?
was looking for a jar file to execute manually and couldn't fine any.

Here's a temporary fix: use shift-command-g in a finder window. That will open a text box. In there, paste ~/Library/Application Support/minecraft and press enter. Now scroll down and double click launcher.jar.

Sam - you are a star - this works. Great temporary fix 🙂
Thanks (I can now relax, I had braced myself for the melt-down of my ADS boy who will come home from school soon)!

I am unable to locate launcher.jar

When following Sam's method I get a warning about "outdated launcher" and about resetting my settings - exactly which settings will be reset and which files should I backup beforehand?
OSX 10.10.4, have tested updating the new launcher (both with an automatic update yesterday and several manual updates today, nothing works, stuck on "preparing"). Edit: New launcher which doesn't work is version 2.0.799.

Matt, I just 'agreed' to reset - these are minecraft launcher settings as far as I experienced, and minecraft started ok after that (from the old launcher).
However, the issue is now fixed and I can launch with the new launcher.

Thank you, the old launcher works!
also having this issue, was playing fine, went to lunch, new launcher and now stuck at preparing. Mac OS X 10.11.6 El Capitan