Okay, looking at the standard tissues, it seems like nothing has changed, so I dunno why this is bugging out.
[CREATURE:INUGAMI]
[DESCRIPTION:A dog spirit, known to posess humans and occasionally serve them.]
[NAME:inugami:inugami:inugami]
[CASTE_NAME:inugami:inumgami:inugami]
[CREATURE_TILE:'I'][COLOR:7:0:1]
[LARGE_PREDATOR][NOFEAR]
[TRAINABLE][PET][FLIER]
[BONECARN]
[CLUSTER_NUMBER:3:7]
[BIOME:TUNDRA]
[BIOME:FOREST_TAIGA]
[BIOME:ANY_TEMPERATE_FOREST]
[BIOME:SHRUBLAND_TEMPERATE]
[PREFSTRING:fierce loyalty]
[BODY_DETAIL_PLAN:STANDARD_MATERIALS]
[BODY_DETAIL_PLAN:STANDARD_TISSUES]
[BODY_DETAIL_PLAN:VERTEBRATE_TISSUE_LAYERS:SKIN:FAT:MUSCLE:BONE:CARTILAGE]
[BODY:BASIC_1PARTBODY:BASIC_HEAD:BASIC_FRONTLEGS:BASIC_REARLEGS:TAIL:2EYES:NOSE:2LUNGS:HEART:GUTS:ORGANS:THROAT:NECK:SPINE:BRAIN:SKULL:MOUTH:RIBCAGE:GENERIC_TEETH_WITH_LARGE_EYE_TEETH:5TOES]
[USE_MATERIAL_TEMPLATE:NAIL:NAIL_TEMPLATE]
[USE_TISSUE_TEMPLATE:NAIL:NAIL_TEMPLATE]
[TISSUE_LAYER:BY_CATEGORY:TOE:NAIL:FRONT]
[SELECT_TISSUE_LAYER:HEART:BY_CATEGORY:HEART]
[PLUS_TISSUE_LAYER:SKIN:BY_CATEGORY:THROAT]
[TL_MAJOR_ARTERIES]
[BODY_DETAIL_PLAN:STANDARD_HEAD_POSITIONS]
[BODY_DETAIL_PLAN:HUMANOID_HEAD_POSITIONS]
[BODY_DETAIL_PLAN:HUMANOID_RIBCAGE_POSITIONS]
[USE_MATERIAL_TEMPLATE:SINEW:SINEW_TEMPLATE]
[TENDONS:LOCAL_CREATURE_MAT:SINEW:200]
[LIGAMENTS:LOCAL_CREATURE_MAT:SINEW:200]
[ATTACK:BITE:CHILD_BODYPART_GROUP:BY_CATEGORY:HEAD:BY_CATEGORY:TOOTH]
[ATTACK_SKILL:BITE]
[ATTACK_VERB:bite:bites]
[ATTACK_CONTACT_PERC:10000]
[ATTACK_PENETRATION_PERC:10000]
[ATTACK_VELOCITY_MODIFIER:30000]
[ATTACK_FLAG_EDGE]
[ATTACK_PRIORITY:MAIN]
[ATTACK_FLAG_CANLATCH]
[ATTACK:SCRATCH:CHILD_TISSUE_LAYER_GROUP:BY_TYPE:GRASP:BY_CATEGORY:TOE]
[ATTACK_SKILL:GRASP_STRIKE]
[ATTACK_VERB:scratch:scratches]
[ATTACK_CONTACT_PERC:100]
[ATTACK_PENETRATION_PERC:100]
[ATTACK_FLAG_EDGE]
[ATTACK_PRIORITY:SECOND]
[NATURAL_SKILL:GRASP_STRIKE:10]
[NATURAL_SKILL:BITE:10]
[HAS_NERVES]
[USE_MATERIAL_TEMPLATE:BLOOD:BLOOD_TEMPLATE]
[BLOOD:LOCAL_CREATURE_MAT:BLOOD:LIQUID]
[BODY_SIZE:1:0:100000]
[CREATURE_CLASS:NATURE_SPIRIT]
[MAXAGE:60:120]
[NOCTURNAL]
[HOMEOTHERM:10067]
[SWIMS_LEARNED][SWIM_SPEED:2500]
[FANCIFUL]
[NATURAL_SKILL:GRASP_STRIKE:10]
The tissue layers haven't been altered in any way, so I'm not sure what the issue is. I just get a big list of "no tissue thickness" errors when I start up the arena.