From time to time, the macOS Accessibility Security & Privacy settings will break and fail silently without showing a macOS error code (this sometimes happens when Apple releases an update to macOS). For all intents and purposes, everything looks fine...
When the macOS Accessibility Security & Privacy system breaks, it causes Synergy to mysteriously stop working, often with “Error code 11” (yeah, we really need to improve that error message). This error code typically means that the entry for Synergy under the macOS Accessibility Security & Privacy screen is not valid any more and we need to do something to fix it.
If the Synergy entry is not enabled: Enable it (click the check box to the left) and try to restart Synergy. If that doesn't work, try the next steps.
If the entry for Synergy is enabled, but Synergy still isn't working:
For more help using the macOS Security & Accessibility settings, check out the Apple help article, Customize your Mac with System Preferences.
If the problem is still not resolved after doing this, you may need to uninstall Synergy, remove the Security & Privacy Accessibility entry for Synergy, reboot, and then reinstall Synergy.
One last thing to try before getting in touch with us...
Warning: Please only attempt this last step if you are familiar with the Terminal app.
Try running the following command from the Terminal app:
-code- % sudo tccutil reset Accessibility -/code-
If this article didn't help, you can talk to someone on our support team (unless we sent you here, in which case please reply via the ticket you already have open).