I just installed FS2 Open a few weeks back, and I played through the Freespace and Silent Threat campaigns (via FSPort) before moving onto Freespace 2. I switched the mod to "mediavps" in the launcher, which made the Freespace 2 campaign the only one available in the game. I started playing and was moving along, when I ran into something weird. I just finished the "A Game of Tag" mission, and started to play the next mission "Proving Grounds" (SM2-03) but I had trouble passing it (I was trying for the medal, which is harder to get than simply passing the mission). I tried it several times before quitting the game (I believe I used the "Quit Immediately" keys, if that makes any difference), and when I went back into the game, it skips that mission. It starts playing the "mono2" video, which I know is supposed to play before the "The King's Gambit" mission (SM2-04). Strangely enough, the previous mission doesn't show up in the Tech Room under Campaign Missions, so the game doesn't think I completed it. Yet it skips it anyway. I tried exiting and relaunching the game, and the same thing happens. Although SM2-03 was making pull out my hair, I don't want to skip it.
I was thinking I would try opening the FreeSpace2.cs2 file for my pilot, but I don't know what to open it with. The FS2 Open wiki says the "cs2" format is plain text (
http://www.hard-light.net/wiki/index.php/*.CS2), but it doesn't seem like it. If I open it with Notepad++ (or the Campaign files for Freespace or Silent Threat for that pilot), it shows a lot of gibberish with the actual text. I'm guessing that the FreeSpace2.cs2 file is corrupt somehow, but I don't know how to confirm it without opening it somehow. I tried one of the old Descent Manager tools, but it didn't recognize the Freespace 2 Open install (the tool is 9 years old, after all). For that matter, I believe the cs2 format is different from the retail campaign format, so that probably wouldn't work anyway.
Any suggestions?