Early on December 29th our team was alerted to a bug in the system that displayed error messages to system users while trying to navigate the application. It also broke many tracking links inside of email campaigns previously sent out. When recipients tried clicking on links they received a license expired error message. This bug was caused by a series of added features added to the system on September 20th. The bug first appeared as early as December 28th and was resolved by December 29th by 11am.