Per Mattermost guidelines, GitHub issues are for bug reports: http://www.mattermost.org/filing-issues/.
For troubleshooting see: http://forum.mattermost.org/. For feature proposals see: http://www.mattermost.org/feature-requests/
If you've found a bug--something appears unintentional--please follow these steps:
Bug report in one concise sentence
How can we reproduce the issue (what version are you using?)
Describe your issue in detail
What did you see happen? Please include relevant error messages and/or screenshots.
If you can, link to the line of code that might be responsible for the problem