Windowed mode keeps coming back

Dear Ipacs/fellow simmers,

Just the other day I bought a new 27" monitor with 1440p settings. Trouble is that Aerofly FS2 keeps starting the game up in windowed mode. When I put the settings back on 2550x1440, it either fails to do this correct and I only get to see a part of the screen enlarged (which my computer automatically readjusts, which is fine except for the fact that the buttons are not readjusted so none of the clickable parts of the intro screen are where the should be) or all goes well and I am able to fly the simulator. Even so, next time I start Aerofly FS 2 it again starts in windowed mode and I have to readjust everything again.

How can I fix this or is it a known bug?

I have tried starting the simulator in admin mode, but still it keeps going back to windowed mode next time I start Aerofly.

I found out it keeps going to windowed mode because I have a 125% zoom for apps and text set up in my screen setup. Setting this to 100% fixes things.