If they are actually welded, you've got some serious problems or a very old version of max. If they are just sharing the same W space and the boarders aren't showing up, it's not a big deal. Have you tried adjusting their W coordinates? It allows you to push the pieces forward and back. U = Horizontal V = Vertical W =…
Do a CTRL-A to select all, then type in "0" in the W field at the bottom left (shown in Ott's screenshot). You shouldn't have to change mode at all, it's just W values getting thrown off hugely, I find the easiest way is just to reset all verts to W = 0, it won't mess with any of your existing mapping and it's probably the…