[propbeanie]

If the Mission Editor (ME) closes when you open the RND layer, then there is something not compatible in the file with the ME. Several things to check... be certain that you use the ME in the LSH folder -AND- that you are opening the Campaign_RND.mis file in that same game folder, else things will most likely crash like that. For whatever reason, both the SH3 and the SH4 ME apps remember your last-used folder, no matter where you open the ME from. If you do not use the correct ME (so it can read the correct game Roster folder), and the correct Campaign files (so it can "call" the proper modded Roster folder), then things can get wonky real fast...