first off, looks great! i might have to employ that little bugger, second...post offices are over done. i'd go with a more vintage approach to the matter and find a nice clock tower!
((for any feds reading through this site...we're just kidding alright...no need to illegaly tap our phones and PC's, post 'round the clock observation, and dig through our garbage))
as for the problem itself, if it's still buggy maybe upload the pre conversion .COB file and texture set, any body that downloads will have to run it through PCS themselves. might side step the problem for now if it still is a problem. just an idea.