UE3 - UT3 Sky package error

Hello everyone, I know the Unreal 3 Editor isnt completely stable yet but ive been having a strange bug as of late, the Sky package wont open anymore despite working perfectly for a while. Everytime i open the Sky package it crashes the editor (all other packages open fine).

Anyone have any idea what the problem could be or should i reinstall UT3? I'm using the latest patch too just in case you were wondering.

Thanks for any help!

Thanks for your reply, as far as im aware of i havent edited the file nor do i get a log after the crash. I may try a reinstall later tonight and see how that goes, will post back if it works or not.

Well a fresh reinstall didnt do any justice but i did find the problem and fixed it. There was a Un_Sky file in the 'Documents/My Games...etc' folder, i deleted it and now the orginal package opens in UnrealEd.