I have the exact same problem

What version of Automation are you running? Main, or Open Beta? What does the launcher say about the mods you are running? Are they marked as compatible?

Running the main Unreal Engine version of the game. Not 100% sure on how to check compatibility, but all the current mods i use were made for the current version i'm running.

I have quite a lot of them installed and way too many vehicles laying around. Could it be a RAM or fixture id problem? If fixtures mods have id's that is.

Likewise. I'm using the main branch UE4 version, and I'm using UE4 compatible mods. Ironically I changed to UE4 versions having previously used Kee optimized versions and now they don't work. Even though I'm using the UE version.

It's not really that big of a problem. It's mostly flavoring either way. I'm sure it'll solve itself after a couple of clean-ups of my mod list and created vehicles. Maybe have a go at reinstalling the game. If that doesn't work then it might just be the mods themselves, even though they have worked in the past. Point is, no worries, i am still enjoying the game a lot and will continue to do so even if a couple of fixtures won't load.

Those mods will start working again as soon as the stable branch is updated with the open beta content. And when that happens, some other mods will likely stop working until the modders update them. It's a bit confusing, I know, but it'll sort itself out in time when the modders get around to it.

Ahhh, thanks a lot Accent!

For now I've reverted back to the older versions, they seem to work fine with the exception of the Diffuser. Which is a slight bummer, it's probably the mod I most wanted.