Anybody with these kinds of problems, please restart PT4 using the logging enabled link on your Start Menu, reproduce this problem and then report it via our support system
with the log file - that will help us figure out what is going on here and get it fixed for you. 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. You can open the folder first before starting import.
Post your ticket numbers here after sending in your logs and it will be a big help for us in figuring out what is causing this behavior for you.