The following steps made the problem occur:
Start Flight
Open Aero-GUI
Finish Flight by Recovering Vessel
Click away the events menu thing (the one that shows stats like max G, max speed, max altitude etc.)
Click on "VAB" after the Flight has been recovered
Voila, there's aerodynamics statistics in the Vehicle Assembly Building
This is a very minor bug and I don't expect it to be high on the priority list. Cheers, hope the next update will be good