I had all the same problems ... crash on load, missing cars, spawning outside police station and getting stuck, etc. OpenIV broke my game! The ped props on my officers also stopped working after I got the latest OpenIV update and installed some player mods. I did a clean install of the game and used only SparkIV and this now works correctly. Kudos on a great mod -- these are the best looking and feeling cars I've used so far!