If you've edited game files, just reinstall the whole thing, or just delete both your London Mod and LA Mod and install them if you've only edited mod files.
Whenever i select a vehicle-Medical and Fire and sometimes Police- the game slows up to a point of unplayability, meaning i have to deselect the units. This means it's impossible to do All Hands Calls quickly because the game dies when selecting 4+ units. Anything, guys?
Londom Mod is based on LA Mod, meaning the missions are already there. Like most mods, LA is used as a base to expand on, and it is rare a mod can take off from the main game. I believe transferring the files was unnecessary...?