e-Sword 10.x uses the internet to check the modules you have installed against those in a database on the e-Sword server. e-Sword blocks abbreviation names like RSV and NIV unless they are official (encrypted) modules. e-Sword can also block other abbreviation names (I think there was a Bible module that was blocked for a while).
You can change the tab name with the Tab Renamer. Or block e-Sword from connecting to the internet with a free firewall like Zone Alarm (zonealarm.com). Or, simply return to where you purchased it, and they can give you the official (encrypted) versions that won't be blocked.
what are you supposed to rename files so that they will show? i read thread in faq and it said not to rename the official name. what will work?