Ok guys so I figured out the issue with the new OpenIV update. When you go to import a new file it doesn't replace the file, it simply adds it as a new vehicle no matter if it is the same vehicle or not. Easiest fix is to delete the file you want to replace and add the new file or simply replace each .wtf and .wtd as one. I found that when I wasn't doing this that when I got in game I either crashed immediately or none of my cars would spawn.

 

If this helped please give it a thumbs up. If you find any additional issues post them here or if you find other ways to fix it post them here.   

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or you can just drag and drop, that replaces the exsisting files.