Open PT4 and click File -> Open User Data Folder. Double click the Config folder. There's a text file called PokerTracker.cfg (it may show up as a CFG type file called PokerTracker), right click on it and open it with Notepad or Wordpad. There should be a section called [General] -- where that text appears on its own line. Right under that add the text:
Community=N
Then click File -> Save, close the text file and close and reopen PT4. It should work now and once we have 4.10.4 out you can remove that setting and things should work again.