Check out this post. See if it what you have done. The symptoms sound the same.
http://forum.x-cart.com/viewtopic.php?t=7926&start=0&postdays=0&postorder= asc&highlight=
I was trying to get rid of other languages and keep only English. Another member, adpboss, helped problem solve and restore my site. I am not by any means savvy at this. I would PM him, tell him I sent you, and he should be able to assist you if one of the Moderators cannot.
Hope this helps.
Janet Allard
