[v0.99 BUG] maple stops responding when you press "scroll lock"

Describe the problem. Be as specific as possible!:
A red recipe dropped from the buff pig in Future Henesys so I thought I should screenshot it while it was on the floor. Lo and behold: MapleStory freezes.

Windows XP
AMD Turion 64 Mobile ML-30
1.60 GHz, 1.37 GB RAM

windows mode: 1024 x 768

EDIT: there doesn't seem to be any problems when taking screenshots in fullscreen mode or in windows mode 800 x 600

 Images of problem

n/a

I've been having this problem for quite a while now, but instead of freezing, the game simply closes by itself. Fullscreen mode doesn't cause the game to close though.