Gmap/Level application error

[Jiroxys7]

this is a new one..
well actually, i saw another thread with someone who was using vista getting this error.. but i use XP 0.o

anyways, while fooling around with a gmap. i realized one of my levels got messed up. when a player enters, other players cant see that player or any other player in the level (almost like an instance)
the tiles are shifted at the top. and warpto's are glitchy when your target is there.

so i went to edit the level, and heres what i got:

"Exception EListError in module GraalEditor.exe at 0014CA5F.
List index out of bounds (14)."

i hit OK and then the following will pop up immediately afterwards:

"Access violation at address 004F6B63 in module 'GraalEditor.exe' Read of Address 00000008."

any solutions or fixes to this problem?