I ran into this one with my newest laptop where minimizing or windowing a full screen RDP session will not full screen with the buttons at the top again

After a bit of searching I found that the keyboard shortcuts will work correctly to re full screen

CTRL+ALT+BREAK is the official one CTRL + ALT + PAUSE works for me on my laptop as well (so I dont have to press the function key as on my laptop the Break is a function of the Pause key)

This is one I spent a bit of time finding and figured I would post apparently AVG flags a false positive for the ANNO exe file and it should be safe to just ignore

Long term it is probably a good idea for you to set up an exception for the installation directory for the game as well

http://www.gamefaqs.com/boards/626105-anno-2070/61109298