Dutch mod leftovers will not be the cause of your problem if you did the recommended WOFF procedure to remove WOFF completely.
If you understand how JSGME works you will realize this.

Once WOFF is reinstalled just don't activate your mods all at once. If you suspect a mod is the problem, only activate one and test with it and when you are sure you are not getting any failures then go add another mod and repeat the testing again....

My recommendation would be to not activate any mods until you have run WOFF for a long enough time to be sure there are no failures as your first exercise.

Best Regards

Then please, tell us how does that JSGME tool work!

Dutch;

JSGME does a backup before implementing a mod. It stores the backups in a folder called "!Backup" which resides in your "MODS" folder.
The "!Backup" folder is a hidden folder so you won't see it unless you use windows explorer "Folder Options" to make the hidden files visible. I won't go into explaining in detail how to do this unless you need me to do so.

JSGME will then restore the contents of the "!Backup" folder back to your WOFF installation folders when you remove the mod from the active side of JSGME.

Does that help? If you need more details, just ask.

Thanks, for explaining.

One mod was causing this when an airfield building was destroyed. Maybe someone knows which mod that was? I'd try updating that and see how you go since I had the same problem for a while and this fixed it for me.

Ace, that was fixed in the release of V2.6 of the "WOFF UE Consolidated Custom Airfields Mods Repository Folder" . To be specific it was the sub mod “WOFF UE 0 – Airfields – Models for Airfields by Panama Red” contained within the previously mentioned mod that had the problem.
Generally speaking, it is best just to update all the sub mods when a new version of "WOFF UE Consolidated Custom Airfields Mods Repository Folder" is released.

Cheers