Erm...Anyone want to help?
Everyone wanted to help, but you ignored their advice entirely.
For myself, I wouldn't be looking at your new raw entry without making sure that it's the problem. Remove it and see what happens. Second, I would definitely remove those spaces. You say they definitely don't cause the problem, and you're probably right, but you didn't even try to change it. I'm going to try to make giant badger men on my end and change things one at a time until I find out what breaks it.
edit:
On a hunch, I copied your creature into the game without modifications, and it didn't crash when I entered the arena. However, it displayed with the name "nothing" in the creature list and crashed when I tried to spawn it.
Due to this, I have determined that there are, in fact, two problems, not one. One is with your creature, the other is not, but probably has something to do with the raw file you put it in. Can I please see the entire text content for the file, as well as it's file-name?
edit2:
Stick this in the raw file AFTER badger men (I would put it after giant badgers too, for neatness).
[CREATURE:BADGER MAN, GIANT]
[COPY_TAGS_FROM:BADGER MAN]
[APPLY_CREATURE_VARIATION:GIANT]
[DESCRIPTION:A huge humanoid with the head and stripes of a badger.]
[GO_TO_START]
[NAME:giant badger man:giant badger men:giant badger man]
[GO_TO_END]
[SELECT_CASTE:MALE]
[CASTE_NAME:giant badger man:giant badger men:giant badger man]
[SELECT_CASTE:FEMALE]
[CASTE_NAME:giant badger woman:giant badger women:giant badger woman]
[APPLY_CURRENT_CREATURE_VARIATION]
Tested and working, as well as kicking ass. One thing to note is that the giant template makes things twice the size, but giant badgers are twenty times the size of a normal badger, thanks to this:
[CV_REMOVE_TAG:CHANGE_BODY_SIZE_PERC]
[APPLY_CURRENT_CREATURE_VARIATION] <- this line isn't important to consider right now, the others are
[GO_TO_END]
[CHANGE_BODY_SIZE_PERC:2040]
The giant badger men I've given you are twice the size of badger men, which are already much larger than badgers. Done some testing, and they'll still kick a normal badger man's ass any day of the week. Good day sir, and may you listen to other people when they give you advice.
All that being said, however, I figured out what the "nothing" problem was and it had to do with the fact that I had my definition in a different file, and it came alphabetically before the creature_temperate that you find the badger-men in. It has to come after, so I put it in the same file to be sure. After testing your own version after fixing my problem, it turns out that your raw definition has nothing wrong with it (except that it's a horrible mess and about 10x the size I would make it). As I said initially, "For myself, I wouldn't be looking at your new raw entry without making sure that it's the problem."