I had that stupid bug for a while when I first installed the Steam version; took me ages to fix it. It was, I think, caused by some kind of local file changes from a patch that Steam didn't like.
I'm a little cautious about suggesting a local file integrity check because you might end up reverting back to the GR launch version and having to update again, which would be a pain, but it might also fix it.
Interestingly, installing the NCSoft launcher seems to make it take over the duties of the old updater via Steam (i.e. launching CoX through Steam will fire up the NCSoft Launcher instead of the updater), so that is a possible option.
Omnes relinquite spes, o vos intrantes
My Characters
CoX Chatlog Parser
Last.fm Feed
I had the NCsoft launcher installed prior to all this, though.
So, up until today I've been playing CoX through Steam (having purchased it through there) just fine. Today, however, whenever I try to launch the game I get the "This game is currently unavailable" shpiel. Can someone help me out? Is there anyway to run it through Steam again (I like tracking my playtime) or do I have to use the other launcher?