1. Please enable logging, reproduce this problem
and then send your log file to us in a Support Ticket
so we can see what's going on here. You can access the 'Logs' folder with the log file by clicking 'File --> Open User Data Folder' in the main PokerTracker 4 window and the file we need is the text file called 'PokerTracker4' or 'PokerTracker4.log' that is in that folder.
2. In the converter software you can select the output format for the site you want. I suggest using Chico so they import into PokerTracker 4 under the correct site and will not be subject to PokerStars HUD restrictions.