Hum this loading screen mostly indicates , that the client isnt aware of your new map.So either something is actually wrong with the map.dbc(and in the video you didnt do anything wrong) or the adts/wdt is causing the crash.May i ask where you located your mpq and how you named it?In the video you said patch-9.mpq but .mpq without capital letters.Or did you place the mpq in the language subfolder? (like data/enGB ; data/deDE or sth like that?)