The devil is in the details
Just finished a battle with WordPress and FTP. Some of the stylesheets and the local translation file (.mo) did not load properly. After some trouble I found out that since my FTP transfer was happening from a Linux box (Unix base) and the server is also Unix based the transfer needed to be Binary and not ASCII. Unbelievable that these things are still not in sync in the standards and you need to get into protocol stuff on a simple ftp transfer.