Put the summary of the bug you're having here
What I expected to happen was...:
When I log in and click play the game usually opens.
What actually happened was...:
When I log in and click play a Crash Report opens instead of the game.
Steps to Reproduce:
1. Click the Minecraft icon
2. ...Log in page opens
3. ...Click the Play button
4. ...Crash Report log opens
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[media]

Your client ran out of memory. Either assign more memory or use a smaller resource pack.

See MC-12949