Due to the fact that the scmdraft I use is broken, and can't even run, I seemingly found a glitch as I began using the Campaign Editor.

I'm going to assume this had already been discovered years ago, but I'll write it out anyways. This can help people that do not trust StarForge, Scmdraft, Xtra or any other third party map editors.

In parenthesis will be examples/samples.
1. Pick the race you want for a specific player. (Terran)
2. Place any unit from that race. (Marine)
3. Delete all units (Delete the Marine)
4. Change the race (Zerg)
5. Press the Undo button (Ctrl+Z)
6. Place the current race's units. (Zerglings, etc.)
etc. Repeat from Step 3 to Step 6.

Very old.

Why is it broken?

I don't know. First, it gave me an error whenever I open locations. Then later, it's just broken whenever I run it either through opening a map or the application itself.