Since MSFS SU11 (or possibly FSRealistic Pro v2.1.0), GSX and FSLTL have not worked as long as FSRealistic is open. If I close FRSRealistic, both other apps work. It looks to be a problem with Simconnect. I've experienced this with v2.1.0 and it's there too with v2.1.1 which I've just installed after deleting all previous files. Any ideas you have for a possible solution would be much appreciated! Thanks.
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I had the same issue. I disabled FSRealistic, put the autostart off in the settings. After a re-start of MSFS, I opened FSLTL first. After all traffic has appeared, I switched FSRealistic on. Even after changing from Ben Gurion to Heathrow (much beyond the maximum FSLTL range), it still worked.