Press the game launcher's Clean XML Folder button (under the 'Clean' tab) to clean and sync your game for online play.
The Check Version button can be used to determine which player(s) have their games configured incorrectly and is found in the 'Update' tab.
Low Frame Rate?
To increase your game's frame rate, try reducing the in-game visual settings through the main menu.
Republic at War's minimum system requirements can be found in the RaW FAQ