We always using splitscanline for rendering big still images over network.Its better then DR because givs possbility to use more then 10 computers and much easye to fix problrms if some of comps fails or making something wrong. But render elements is not compatible with this mode of rendering.
Yep, this is a general problem of 3ds Max though, and there isn’t much that we can do on our side unfortunately.
Best regards,
Vlado