What version of PT4 are you using? If it's not 4.14.11, please upgrade. If it is:
Open PokerTracker and go to File -> Open User Data Folder Browse to the "Temp" folder Delete all files beginning with the letters "aof" Restart PokerTracker and your premium add-on's will re-download and install
This has started happening to me again after I got a new computer. I thought I was rid of the problem when the fix came out, but now I am getting the crazy hud with premium stats. I have version 4.14.11, and I have been through this process with deleting the files. 'Replace with original' doesn't even work as a temporary fix now.
Please create a support ticket so that we can investigate further for you - to date nobody else that I'm aware of hasn't had their Premium issues resolved with the latest release.