When I start the launcher all is well, when you click the button to play the game the Mojang window appears as normal then crashes after a few seconds, there has been a couple of times that the game launches to the main menu then crashes. Whilst looking in task manager when loading the game I noticed that minecraft appeared in the list twice. So I clicked one and selected end task and the game started normally. However, on some occasions, it would close both instances and shut down the launcher.
Linked issues
Attachments
Comments

I have changed my computer username and the problem still exists
Â
We do not have enough information to find the cause of this issue.
Please attach the crash report found in {{minecraft/crash-reports/crash-<DATE>-client.txt}} here.
If you cannot find a crash report, please attach the full launcher log found in {{minecraft/launcher_log.txt}}.
This issue has been temporarily closed as Awaiting Response. Once the requested information has been delivered, the report will be reopened automatically.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki