Start with the suggestions in the Debugging document. If those steps don't work, when you report an issue either here on Discuss or on the appropriate GitHub repository, please include the following information:
- Which version of Atom are you using?
- What OS and version are you running?
- Do you have Emmet installed?
- Can you reproduce the issue after completely exiting Atom and restarting using
If you don't include this information, we're probably just going to ask you for it first thing anyway