I already sent a support ticket with log for this problem, but I figured I would create a post aswell to make people aware of the problem.
The problem is an "error" saying OnGame: Warning: Unrecognized game type: PlayerX bets $77.60, collects $77.10, net -$0.50 (Hand #XXXXXXXXXXX).
This problem made me only import around 1100 hands of a total of 2250 in the Ongame database file. Pokertracker 2.17.03j imported all the hands without any problems.
I'll also mention that think twice before you reinstall PT3 with the beta 26 build, as the beta 27 changed your database giving you only errors if you try the beta 26 with the new database format. This error is the "unable to execute query: COPY holdem_hand_summary FROM STDIN;; Reason: Fatal Error..." problem that has been explained previously on this forum as often a result of faulty hardware or system crash. So if you tried this already don't worry about hardware problems etc, and install the beta 27 again to "fix" it.
Hope there will be a quick fix for this, since I dont't feel like reinstalling postgresql for beta 26.