I have about five Real Flight simulators that we use at school for our after school rc club students. The software worked great back before covid and after installing on our new machines it loads and when we attempt to change aircraft the program freezes and the program needs to shut down. This problem is consistent between machines and on all RealFlight versions 7.5 and 4.5. Is there anything I can do to fix this? We have nearly $1,000 invested already. Thanks!