MSFS 2024 Unable to load IAH with Max 8 or Fenix (after BFU)

[virtuali]

Umberto — what’s the plan of action going forward? Let us know please.

As I said already, in order to "fix" something, I should be able to reproduce it first. Right now, I can't, even with Navigraph, GSX and BATC all together. I'm using the latest SU4 Beta, not sure if this might be a factor.

I can only try wild guesses. Do you have a traffic pack installed, like FSLTL or FS Traffic ? If yes, trying to see if you can stop the crash by temporarily disabling those (if you use the Addon Linker, it should be easy to do).

[debbert]

Hey Umberto. I tried that this afternoon. I removed FSLTL completely. Unfortunately it still freezes at IAH on spawn, with GSX running.

[virtuali]

Hey Umberto. I tried that this afternoon. I removed FSLTL completely. Unfortunately it still freezes at IAH on spawn, with GSX running.

I had high hopes for this, because the ONLY thing "unusual" KIAH does compared to a normal scenery, is that it uses whatever 3rd party traffic products you might have, and use some of the models there to use as static airplanes inside the maintenance hangar. So, maybe, a problem with one of those models might cause a crash, and this was the ONLY thing I haven't tried recently.

So, if you say your only 3rd party traffic product is FSLTL, and you are sure it's not active in the Community folder, then we are back at the "Can't reproduce it" step.

FYI, KIAH will search for models to use from the following folders:

"fsltl-traffic-base"
"justflight-aircraft-traffic-fleet"
"aig-aitraffic-oci-beta"

[TheDavid737]

Umberto - throughout the troubleshooting steps of this thread, I know myself and other users are having the issue even when using default IAH scenery, removing FSDT IAH. So not sure that helps with anything.

[virtuali]

I know myself and other users are having the issue even when using default IAH scenery, removing FSDT IAH.

That's changes everything! There must some issue in the KIAH area then, like Navdata or something else around there.

[TheDavid737]

I know I’ve tried a completely empty community folder. Fresh install. Everything works fine. As soon as I add GSX to the mix, I start seeing symptoms. FSDT IAH works fine as long as GSX isn’t running.

[virtuali]

As soon as I add GSX to the mix, I start seeing symptoms. FSDT IAH works fine as long as GSX isn’t running.

Now you are saying something different, compared to before, when you said even the default KIAH caused a crash. Have you then tried the default KIAH with GSX ?

If it's only GSX+KIAH, see my previous reply about AI Traffic used as static, which is something extra GSX does at KIAH. Of course, I repeated multiple times a simple test like this with "GSX+KIAH" and of course other add-ons like Fenix, in one of my first replies:

https://www.fsdreamteam.com/forum/index.php/topic,33602.msg211131.html#msg211131

[TheDavid737]

I have made this point a few times. Myself and several others have stated the issue is occurring with default KIAH as well. Yes I have tried an empty community folder with nothing but GSX in it and an aircraft that is native FS2024. I also have AI traffic disabled in the sim.

It comes down back to my notes earlier in this thread. If GSX is disabled, I have no issues at all with any combination of addons at KIAH. If I try to spawn at KIAH (default scenery or not) with GSX running (no matter if community folder is vanilla or not), I get a freeze. Sometimes I can get loaded in and the freeze occurs within a few minutes or in taxi. Now, if I’ve left another airport and fly over IAH, I get a crash to desktop if GSX is running. Again, if I disable GSX I get no issues at all.

[virtuali]

If you get a crash AT KIAH, no matter if you use a default scenery or FSDT, then it's clearly not a problem of the scenery. Since I can of course run GSX at KIAH with no issues, that leaves only those possibilities why you are getting a crash there, but I can't:

There's a problem with the Navdata (the API or the data itself) in the KIAH area, GSX makes the normal Simconnect query to it, and that cause a crash because of a problem in Simconnect itself (bug in the sim) or a problem in the Navdata (that can be either default or 3rd party).

So, unless you have another add-on that also makes a Simconnect call to get data about the airport using the Navdata API, you won't see the crash until you enable GSX.

Now, why I can't reproduce it, when I already tried with and without Navigraph ( default or 3rd party Navdata ) ?

- Bug in the sim. I'm using the latest SU4 Beta. According to the latest release notes, they HAVE fixed two overflow (crashing) bugs in Simconnect, and in the previous beta, they fixed a bug with the Facilities API (which is what we call "Navdata API" ). I don't know if these were *new* bugs introduced with the SU4 Beta, or new *fixes* for bugs that has been there before, that would change in case you either have or not have the SU4 Beta.

- Assuming it's NOT that Simconnect bug that has been supposedly fixed in the latest beta, your source of the bad data in the KIAH area might not be default Navdata or Navigraph (which were the only combinations I tried), but something else.

The only thing sure, seems that is NOT the scenery.

[TheDavid737]

I would agree it’s not the scenery. That assumption was made earlier in the thread through troubleshooting. I am using navigraph but have tried also with that uninstalled. This issue first started for me around the time PIGS and the ground service model controls were implemented. So back in SU2 days. I have not tried the SU4 beta personally but I know someone else on this thread has and still sees the issue. Not sure if that was the most recent beta release though.

[Fornax]

Yezzzz! Positive result here.
Same flight as was a sure freeze earlier:
* FSDT KIAH + GSX.
* No injected traffic.
* Updated Navigraph Airac to 2511.
* Fenix A320 Frontier.
* SimBrief FPL KIAH-KDFW.
* Start E2 C&D.
* Load AC via EFB: GSX Fuel+Payload.
* GSX pushback...

Taxied out for 15L, departed, left KIAH area...no freeze.

All good! Remark this is on MSFS024 SU4beta .19.
Might be .19 fixed it, as I did get a freeze on earler betas.
PS! SU4 much better than SU3 (performance, night lighting etc), so recommend ppl to try it at this stage.

[debbert]

Yezzzz! Positive result here.
Same flight as was a sure freeze earlier:
* FSDT KIAH + GSX.
* No injected traffic.
* Updated Navigraph Airac to 2511.
* Fenix A320 Frontier.
* SimBrief FPL KIAH-KDFW.
* Start E2 C&D.
* Load AC via EFB: GSX Fuel+Payload.
* GSX pushback...

Taxied out for 15L, departed, left KIAH area...no freeze.

All good! Remark this is on MSFS024 SU4beta .19.
Might be .19 fixed it, as I did get a freeze on earler betas.
PS! SU4 much better than SU3 (performance, night lighting etc), so recommend ppl to try it at this stage.

That is great news. I will hold my breath until SU4 is released. Umberto hasn't been able to replicate the issue yet, though as you've seen MANY people are having the issue on SU3. Do you mind posting in here periodically until SU4 is out to see how your experience continues? I know this is a pain to do, but I figure its worth a shot of asking you.

[virtuali]

I think there might be a critical fix that would affect GSX:

https://forums.flightsimulator.com/t/sim-update-4-beta-1-6-23-0-release-notes-november-7-2025/746005

Fixed SimConnect_SubscribeToFacilities(_EX1) that has been broken on SU4

We surely call this function, because it's the one that allows GSX to get all data for an airport.

[TheDavid737]

I think there might be a critical fix that would affect GSX:

https://forums.flightsimulator.com/t/sim-update-4-beta-1-6-23-0-release-notes-november-7-2025/746005

Fixed SimConnect_SubscribeToFacilities(_EX1) that has been broken on SU4

We surely call this function, because it's the one that allows GSX to get all data for an airport.

Umberto - Quick follow up question. I am hopeful this fixes the issue. However, the question I have is if it broke in SU4 as you say, I just want to remind that I am not on SU4. I am on SU3 and have had this issue since SU2. As stated, this started for me around the time the PIGS system and the ground service vehicle livery manager were implemented into GSX.

[virtuali]

Umberto - Quick follow up question. I am hopeful this fixes the issue. However, the question I have is if it broke in SU4 as you say, I just want to remind that I am not on SU4. I am on SU3 and have had this issue since SU2. As stated, this started for me around the time the PIGS system and the ground service vehicle livery manager were implemented into GSX.

If you don't count the last 2 month, GSX had an average (we measured it) time between updates of about 8-9 days. This means, ANYTHING bad it happen to your sim can possibly happen after a GSX, just because there has been so many.

It's really impossible that PIGS could crash the sim on a specific airport, since *nothing* in the PIGS has any relationship with the airport, they are strictly tied to the airplane profile, and the only thing that would affect them is the airplane door configuration, which would at most cause the PIGS to disappear.

However, a bug in the Facilities API in the sim surely can crash the sim and yes, you can be mislead is "caused" by GSX, but of course it can't work without that API so, we should assume it should work.