I read somewhere that is the "Themida/Packed" that cause the issue.
I'm looking for a unpack L2 (CT1.5), if someone have this file : l2_disablenc-hb.rar (made by fyyre) on his HardDrive, a reupload would be nice :) Original link http://fyyre.ivory-tower.de/old/l2/l2_disablenc-hb.rar (dead) was found in http://fyyre.ivory-tower.de/old/l2/lineage2.html (alive).