Am not completely following, but from what I've gathered, you are needing to copy and replace in all cases regarding map updates, or additions. Otherwise they can crash on you. It sounds like files are being doubled up somewhere. Check your exports/particles/my_objects for any double files. These will have numbers tacked onto the end of them.
Then again, it could also be a problem with the map itself. Have others had problem with the certain same map? It could be stuck on server.