I just downloaded the new PT3 patch (5.02 I believe?) and I just tried to run it with OnGame. It didn't like it:
2009/08/13 17:03:50: OnGame: Starting auto-import.
2009/08/13 17:03:50: PokerStars: Starting auto-import.
2009/08/13 17:03:50: Auto-Import beginning
2009/08/13 17:03:50: OnGame: Found 19 files to monitor.
2009/08/13 17:03:50: OnGame: Loading hand history file: C:\Users\Matt\AppData\Local\P5\RedKings\handhistor y\handhistory-1.log
2009/08/13 17:03:50: OnGame: Loading hand history file: C:\Users\Matt\AppData\Local\P5\RedKings\handhistor y\handhistory-10.log
2009/08/13 17:03:50: OnGame: Loading hand history file: C:\Users\Matt\AppData\Local\P5\RedKings\handhistor y\handhistory-11.log
2009/08/13 17:03:50: OnGame: Loading hand history file: C:\Users\Matt\AppData\Local\P5\RedKings\handhistor y\handhistory-12.log
2009/08/13 17:03:50: OnGame: Loading hand history file: C:\Users\Matt\AppData\Local\P5\RedKings\handhistor y\handhistory-13.log
2009/08/13 17:03:50: OnGame: Loading hand history file: C:\Users\Matt\AppData\Local\P5\RedKings\handhistor y\handhistory-14.log
2009/08/13 17:03:50: OnGame: Loading hand history file: C:\Users\Matt\AppData\Local\P5\RedKings\handhistor y\handhistory-15.log
2009/08/13 17:03:50: OnGame: Loading hand history file: C:\Users\Matt\AppData\Local\P5\RedKings\handhistor y\handhistory-16.log
2009/08/13 17:03:50: OnGame: Loading hand history file: C:\Users\Matt\AppData\Local\P5\RedKings\handhistor y\handhistory-17.log
2009/08/13 17:03:50: OnGame: Loading hand history file: C:\Users\Matt\AppData\Local\P5\RedKings\handhistor y\handhistory-18.log
2009/08/13 17:03:50: OnGame: Loading hand history file: C:\Users\Matt\AppData\Local\P5\RedKings\handhistor y\handhistory-2.log
2009/08/13 17:03:50: OnGame: Loading hand history file: C:\Users\Matt\AppData\Local\P5\RedKings\handhistor y\handhistory-3.log
2009/08/13 17:03:50: OnGame: Loading hand history file: C:\Users\Matt\AppData\Local\P5\RedKings\handhistor y\handhistory-4.log
2009/08/13 17:03:50: OnGame: Loading hand history file: C:\Users\Matt\AppData\Local\P5\RedKings\handhistor y\handhistory-5.log
2009/08/13 17:03:50: OnGame: Loading hand history file: C:\Users\Matt\AppData\Local\P5\RedKings\handhistor y\handhistory-6.log
2009/08/13 17:03:50: OnGame: Loading hand history file: C:\Users\Matt\AppData\Local\P5\RedKings\handhistor y\handhistory-7.log
2009/08/13 17:03:50: OnGame: Loading hand history file: C:\Users\Matt\AppData\Local\P5\RedKings\handhistor y\handhistory-8.log
2009/08/13 17:03:50: OnGame: Loading hand history file: C:\Users\Matt\AppData\Local\P5\RedKings\handhistor y\handhistory-9.log
2009/08/13 17:03:50: OnGame: Loading hand history file: C:\Users\Matt\AppData\Local\P5\RedKings\handhistor y\handhistory.log
2009/08/13 17:03:56: OnGame: Loading hand history file: C:\Program Files\Red Kings Poker\Resources\Databases\relentless19statistics.d b
2009/08/13 17:04:00: Fatal Exception during Auto-Import process: Unable to connect to database: PokerTracker 3 Database
Please open PT3 with the Logging Enabled link and submit a bug report with the log files so that we can look further into what might be causing this for you.