# Troubleshooting

- [No contact with Boomerang 3](/boomerang-3-calibration-app-manual/troubleshooting/no-contact-with-boomerang-3.md)
- [Google blocked the app when Gmail is used](/boomerang-3-calibration-app-manual/troubleshooting/google-blocked-the-app-when-gmail-is-used.md): This problem was present for older versions of the Cal App that was using Google account to send the certificates by email. This option is not used in version 108 and higher.
- [Cal App log files](/boomerang-3-calibration-app-manual/troubleshooting/cal-app-log-files.md)