Dude chill, i just posted my experience, i played 4 hours straight within a group (like 20 sessions) and noone got kicked (not always the same friends in group), and also 2 sessions FFA and didnt kicked, and also we played against other groups and could see all my friends playing normal.
sorry you still have this problem, but what we all have done is manually updating PB after the patch and got kicked everytime the day before yesterday then we gave up, yesterday we didn't do anything with PB and it was normal.
Btw, you said downloaded and installed the file, are you talking about Pbsvc.exe, if thats the case, this updates automatically, but i think for some reason it doesnt, so you have to update it manually if you havent done so, Here are the steps to do that:
1. Download this file:
http://websec.evenbalance.com/downlo...oad.php?file=1
2. Extract and run, let it update, then click on Add Game.
3. Choose Assassins Creed 3 from the Game Dropdown, browse for the correct path of the game and click on Add Game button.
4. Click on Check For Updates, and it will update PB files inside AC3 Folder.
5. Exit the program and you no longer need to run it again.
I hope this will help you or anyone to solve their problems with PB.