The MWLL team recommends that maps be authored with the Crysis version of the Sandbox2 editor. Use of the Wars version Sandbox2 edit will result in maps that are not backwards compatible with standard Crysis clients.
Is this still important? I thought the whole mod had switched over to requiring the Crysis Wars client to play.
Thanks for the guide by the way, has prevented me from asking annoying questions (other than this one) and just let me get on with making a map.
Edit: Is there somewhere I can get that PDF file, would like the pictures that are missing on the wiki.