We have been investigating the recent trade block and login issues that players experienced after the January 14th maintenance. We identified that the issue was caused by a change made to the Sweet Chocolate quest item from a previous Maple World’s Sweet Valentine's Day event. In order to resolve these issues with the item, we have removed these items from all players in all worlds. In addition, players who were previously trade blocked as a result of this issue after the January 14th maintenance, will be unblocked. Players who experienced issues logging into their account as a result of this issue after the January 14th maintenance, should now be able to log into the game.
If you still continue to experience an issue in which you find your account trade blocked or cannot log in after the January 14th maintenance, please send a support ticket on our Customer Support site: https://support-maplestory.nexon.net/hc/en-us
We apologize for the inconvenience and thank you for your patience as we worked to identify and resolve this issue.
-The Maple Team