What version is shown in the lower right corner of your client? If it is not 6.0.6.2685.en, you may need to manually patch the game. Go here:
Why is it Updating/Manual Patches
Download the patches you need. Copy them to the main RoM game folder, then install them in ASCENDING order. Even if the launcher is showing the current update version, you may still need to manually patch the game using the newest patch. Be aware that it is a big one--768MB--and will take a fair amount of time to download, even if you have a nominal 10Mbps/sec download speed, as I do.