If you've purged the hands that's all that should matter.
Please restart PT4 using the logging enabled link on your Start Menu, and let the graph load for a while with no filter (give it a good 5 minutes) then create a ticket using our
support system with the log file - that will help us figure out what is going on here and whether there's something that we need to fix. You can find that file by clicking File --> Show User Data Folder in the main PT4 window - the file we need is the text file called PokerTracker4 that is in that folder.