I have the same problem, but I am not ready to give up my site keywords because I feel that they have improved my search rankings. Can you please explain why the number of site/meta keywords would prevent the software from directing to the confirmation page after checkout?
QUOTE(ddavis - MC Team @ Feb 11 2009, 03:12 AM)

QUOTE(Likuid @ Feb 10 2009, 10:55 AM)

I don't know if a changed something or what, but my site no longer displays the order confirmation. It just instantly jumps back to the homepage after a customer completes check out. Is there a setting for this somewhere or is there something else causing a problem here?
P.S. Using version v4.6.0.7.
Use less keywords in your site settings. You have about 2000 characters worth right now, if you reduce it to about 256 characters it should work.