The winners for summer MOTS are D-ead7Dog, toonanimals317, and Telluric! Congratulations!
Perhaps its die to the amount of lag or it could be the items you are wearing. It happened to me last time when I wanted to get into South Pole and once I took off my item it let me in...its kinda weird. But try taking off items, and if that does nothing then perhaps change your rendering system from OpenGL to Direct 3D9 and turn off your water reflection