Can you copy your entire command line? If you're using Wxlauncher it's in the advanced settings tab, under the custom flags field.
Also your build is pretty ancient, looks like one of the early 3.7.5 nightlies, from all the way back in July. Are you sure you're posting the right log? If you're using a newer build you'll have to take the log from %appdata%, not the one from the Freespace 2/data folder.