DarkDragon, I looked into this to make sure you aren't hitting a bug in SporeMaster 2, and It Works For Me. Unpacking the 11/10/2008 Spore_Game.package, searching for "symmetry", modifying editor_setup~/creatureeditorsetup.prop.xml to <bool name="editorUseSymmetry">false</bool> and packing yields an apparently functional creature asymmetry mod, and nothing disappears. Nor do I see any change in this file between the august and november game packages. Is it possible something else in your mod (or some other mod you have installed) is the problem? Can you post a package exhibiting the problem somewhere? (I suggest the Mod Discussion forum at sporemods.org, which allows attachments)