Brackets stores some data in a cache folder managed by CEF -- roughly equivalent to a browser cache, except specific to Brackets. At the moment, this folder stores both throwaway data and some user preferences.

If you're having trouble starting Brackets after upgrading from a previous build, try deleting this folder (see below). You may lose some stored preferences (especially any custom extension-specific preferences).

• Mac: ~/Library/Application Support/Brackets/cef_data
• Win XP: C:\Documents and Settings\<username>\Application Data\Brackets\cef_data -- (aka %appdata%\Brackets\cef_data)
• Win Vista/7/8/10: C:\Users\<username>\AppData\Roaming\Brackets\cef_data -- (aka %appdata%\Brackets\cef_data)
• Linux: ~/.config/brackets/cef_data -- (aka $XDG_CONFIG_HOME/brackets/cef_data)

Note: for Adobe Edge Code, replace Brackets in the path with Adobe/Edge Code.

1. Quit Brackets entirely
2. Delete the cef_data folder located above
3. In the parent of this folder, delete brackets.json and state.json if present

This will reset all of your preferences and clear all cached data. (It's not yet possible to do clear one of those separately from the other). To ensure a full 'factory reset,' also uninstall Brackets and reinstall from a freshly downloaded installer.