UPDATE 06/19: There have been no crash reports for a few months now, so hopefully this is behind us.
Harmony Bridge, TPL Bridge and Ambi Bridge have suffered from a crash on launch bug on some peoples systems. This seems to have been due to an incompatibility with older versions of Xcode installed on those machines. A workaround has been to delete or rename Xcode on those machines.
Version 1.0.1 of Harmony Bridge, Version 1.0.5 of TPL Bridge and Version 1.0.9 of Ambi Bridge are now released on App Store, and should fix that issue. Apologies for any inconvenience caused.