PokerTracker

PT3 HUD no longer working at sportsbook.com

Merge have updated their software and changed the path where your hand histories are saved.
You will need to reconfigure PT3 to the new hand history location.

Merge Configuration Guide

I understand that the new path is something like:

C:\Users\YOURNAME\AppData\Local\CarbonPoker\history\

..but you can see the exact path in the Merge software, as described in the guide.