FreeSpace 2 Open version: 3.6.17.9465
You used an old 3.6.17 build to make your log, not the newer 3.7.1 build that you were supposed to use. If you still get problems after following the tips below, use a 3.7.1 BP build to make another log. (Actually, you can and should delete your 3.6.17 BP builds; they're broken and are no longer necessary.)
-mipmap
-spec
-glow
Deprecated flag '-spec' found. Please remove from your cmdline.
Deprecated flag '-glow' found. Please remove from your cmdline.
These options are obsolete and should be disabled. (Assuming you're using wxLauncher, -spec and -glow are in the "custom flags" field, and -mipmap is called "enable mipmapping" and is found in the Troubleshoot section.)
Found root pack 'C:\Program Files (x86)\GOG.com\Freespace 2\...
Please move your FS2 installation out of Program Files and to a short path like "C:\Games\FreeSpace2". Moderately long paths, as well as the Program Files folders, are known to cause problems with FS2 Open.
Found root pack 'C:\Program Files (x86)\GOG.com\Freespace 2\blueplanet2\bp2-compat.vp' with a checksum of 0x9c7d79f8
Found root pack 'C:\Program Files (x86)\GOG.com\Freespace 2\blueplanet\bp-compat.vp' with a checksum of 0x6ef45eaf
These files are unnecessary if you're using a BP build.