1)Verify that merge is upgrading the table status properly.
https://tabletamer.com/joomla/index....was-successful
If it doesn't, try removing and adding the site again.
If the tables are upgrading to urgent, I would try adding an exception to your antivirus and restarting tt and your poker client.
2)There is currently no way to limit it to one table to a slot. It has been something I have been meaning to add, but never got around to it. I will eventually add it.
3) In Settings/Layout, turn on hide invisible borders in win 10. Is the issue occurring with all of the sites you play on?