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Tried the simulator in a window as suggested, but didn't make a difference. This is how it looks like:

I can click on any button/image, but nothing happens. Not sure if the green frame is an indicator that something is wrong.

What third party libs are used by FreeRider? Maybe I got some conflicting libs installed. Thanks.

The green frame might be your antivirus software that is sandboxing the program.

If so, you should be able to mark FPV Freerider as safe, or, turn off the sandboxing, you have to check how to do that on your antivirus software.