A cause for the AI placing more than 4 Air units in a stack has been resolved.
F1(HELP) button fixed
Tutorials fixed
Battle events images now synced to the actual event.
AI research tweaked further.
Changed AI build preferences, so it follows its script more accurately.
Fixed several CTD bugs
Improved low manpower situation handling of the AI.

As always with the experimental branch, please do report any issues you had, with a savegame and way to reproduce in the discussion thread