Manager Crashes when using drop down selection on Technician

Problem: In the labor item edit window, clicking the down arrow to select a technician crashes Manager without any error. 

Versions affected: 5.9.x, 6.4.x

Solution: Issue is caused by Comcast Constant Guard software by Xfinity. The program can either be removed or configured to work with Manager. Mitchell1 is not responsible for configuration of third-party software.