I apologize if this is in the wrong section. I'm not sure whether my problem is with FRED2, something I did in FRED2, or something with FSO/MVPs.
So I've been doing things with FRED2 for a while but the other day I started having problems with my missions not successfully starting from the mission simulator in Freespace Upgrade Media VPs. I had just created a new mission, plopped a few objects, and saved it for the first time. When I tried to run the mission for the first time it failed at the loading screen with an error message saying the mission had failed to load. Since this was my first attempt at a scramble mission I thought maybe that had something to do with the problem so I unchecked that box in FRED2, saved, and tried again. Same problem and message.
So I wrote that mission off and started a new one. The mission worked fine the first half a dozen times I playtested it but then I started having the same problem. The error checker in FRED2 doesn't report anything and I have verified file integrity through Knossos. I'm now out of ideas.
I'm running FSO 24.02, Freespace Upgrade 4.7.3, and FRED2_OPEN 24.02. I have enclosed the two missions.