The latest beta version, K-9 Mail 5.714, was released yesterday and includes the following changes:
- IMAP: Fixed refreshing the folder list
- Keep drawer open after selecting an account
- Increased the size of the progress bar shown when refreshing a folder
- Some smaller bug fixes
You can get this version from Google Play when joining the beta channel, or download the APK from our GitHub release pages. It will also be available on F-Droid the next time their repository is updated.