1. Have you used an error display addon like bugsack/buggrabber to catch any errors? This will let you know if there are any programmable errors, it will point to ( usually ) the line of code that triggered the error and the trace back to the addon code that called it.
Link:
http://www.wowinterface.com/download...5-BugSack.html
Link:
https://www.wowinterface.com/downloa...ugGrabber.html
2. Have you looked at the several forum posts regarding what has been identified as changed since the BfA Alpha went live months ago ? This will help you understand what and how things have changed that may be causing your problems.
Link:
http://www.wowinterface.com/forums/f...play.php?f=175
3. With an addon like TauntMaster, I would suspect that the many spell related code changes are the cause. You would have to locate the offending lines and replace them with correct coding. This is almost the norm with each expansion. It could also be connected to the many template objects used. And that was after a quick glance. Using those addons mentioned in item 1 will help identify the offending lines.