In PAHUD, click Options --> Preferences, click on "Hold'em" under databases and make sure your NLHE database is selected (note it needs to be a PT2 not a PT3 database).
Also, are you currently saving hand histories to disk in PokerStars? Please check to make sure these hands are being saved. Are you running the latest version of PT2? Try downloading and installing the
2.17.02a patch for PT2 and see if that helps.