It's a crash everyone gets, iusetobekool. Changing text to Korean in the menu usually fixes it.

There's also a patch I've been using for a few days now, where it eliminates having to change text modes, and I haven't crashed at all.

http://chizuna.com/pic/20030813/SysString-e.lzh

http://chizuna.com/pic/20030806/CommandName-e.lzh

Download those, and extract them to your Lineage 2 system folder.