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.
Missing Build Pads?
Republic at War's tactical Battle Pads allow you to build unconventional units and heroes in both land and space skirmish.
If you can't see them on the battlefield, be sure that you selected 'Custom Maps' when creating your skirmish match.