I don't know why in the world did you omit that feature when you created PT4, but you MUST bring back the possibility to "select" session in order to further analyze them in other tabs like position tab, graphs, etc.
The program main purpose is analyzing our game, not being able to easily analyze session(s) is pathetic.
Another thing which can be very useful is filtering for the last 'X' hands, which I also think is pretty fundamental. But it is not as important as the above.
Thanks.
