Check out the patch notes for the v20 Lovely Update here: http://maplestory2.nexon.net/en/news/article/55909/lovely-update-v20
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For those that still have this Problem this might be a solution for you
1: Right click on your screen and click "NIVDIA control panel"
2: Click on Manage 3D settings
3: click on Program Settings
4: Find Maplestory 2 and click on it (tab under"Select a program to customize")
5: and click on the tab under "Select the preferred graphics processor for this program"
6: Click "Integrated Graphics" then click Apply at the bottom right
7: restart the game and it should work then
I Hope this will help some of you with the Problem. it surly helped me