I keep having this problem where zmodeler will totally disregard what changes I made in the materials editor and remove the some of the textures from a lot of the materials, sometimes even from the texture browser. I also think this is what is causing my cars to spawn with no wheels and causing black lines and streaks to go crazy whenever I go near it. Anyway to fix this? I've reinstalled zmodeler already.

Have you tried importing a DEV vehicle and see if that works properly? Try to import a DEV vehicle, then export it, see if the issue is still there. (note: some DEV vehicles are messy (one of the 2006 impala for example)) If the problem isn't there, try to make some changes, like make a new material, apply that, see if it works etc. Also never delete materials, that'll mess everything up.

Have you tried importing a DEV vehicle and see if that works properly? Try to import a DEV vehicle, then export it, see if the issue is still there. (note: some DEV vehicles are messy (one of the 2006 impala for example)) If the problem isn't there, try to make some changes, like make a new material, apply that, see if it works etc. Also never delete materials, that'll mess everything up.

Thanks Sgt.Kanyo, I remember I deleted a bunch materials so that's most likely the problem