That mission doesn't even load for me!
Please run the fs2_open_3_6_10d-20081207_r4985.exe, try loading the offending mission, then locate the
..\FreeSpace2\data\fs2_open.log file and post it (either in code tags or as an attachment).
StrayFender: Since you're already running the debug build, do the same: post the debug log (NOT errorlog.txt, it's helpfulness is minimal at best). Also, you could try running the non-debug build, (which is named fs2_open_3_6_10
r-20081207_r4985.exe), and/or simply try clicking OK to get past the error. Null moment of inertia errors usually don't crash/stop the game even on debug builds, and release builds typically don't even tell you about them, but you should also check that no old Ravana models are around... (check the root directory for extra VP files, and the ..\FreeSpace\data\models [and other subdirectories] for rogue model files)
I'm not getting any errors with debug build during the Great Hunt mission. Loads fine, plays fine.