EDIT:
I see what the problem is: I didn't changed DB for Import --> Preferences. idiot me
I have done everything you have said and it is also working, but I have still a problem
-the purged DB is now set as "active/default" in the DB management
-in the HUD configuration tab under "HUD Options" I have set the hook on the purged DB
-at the top bar of PT3 it also says correctly: "PokerTracker v3.13.11 beta Database: Walters_PurgedDB"
--> when I started to import, PT3 said I am importing to an other DB as my HUD is referring to, which actually cannot be. But the HUD really did not work correctly.
I tried another way, by not having a hook on any of my databases under "HUD options", because it says when no hook is set, HUD is referring to the DB which is imported to.
--> HUD now works fine
BUT:
somehow, I cannot look up my session any more when I go to "Texas Holdem" --> "Cash Games" --> "General"
no results appear, as If I would have never played the todays session
If I filter for the Monday session, everythings normal.
what is going on?
thanks for you help