As of v122 release the other day, MapleStory likes to lock up the entire computer, pretty much shutting it down. It's impossible to recover without a hard reset.
It mostly does this whenever it is minimized, however, does it randomly even if the window is on top.
I read a topic here about loop back network settings. I don't have any set up, but did install Spybot recently, which makes some adware dial "localhost".

Any ideas? Fresh install of MapleStory, ATI card drivers up to date.