Cannot get past the character selection screen

This happened to me as well and fixed itself after an hour. I think they still have a few bugs they need to kink out with the new system. Sometimes my screen wouldn't move at all, other times I'd log on the character only to DC as soon as I spawn with an "Invalid Pointer".

If you want to reset your PIC, log onto Maplestory's site and go to your settings. There should be a "PIN or PIC restore" button there somewhere.