Can't see other planes

Whether it be on the ground or in the air, if on Vatspy or any other VATSIM tracker there is a plane right next to me, I can’t see the plane. I use FSTL as my injector and multiplayer is set to group in settings. I have watched many videos and tried a lot of things so could someone please walk me through this problem?

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What steps have you tried from the vPilot Tips, Tricks, FAQ and Troubleshooting Guide, and what were the results from each?