Well, I am guessing that the hippotoxotai unit is the one from Arbaces Heirs of Atlantis mod. If so, open data\export_descr_units.txt. Look for "hippotoxotai". You should have an entry like this:
Code:
type hippotoxotai
dictionary hippotoxotai
category cavalry
class missile
voice_type Medium_1
soldier hippotoxotai, 32, 0, 6
mount light horse
mount_effect horse -1, camel -4, chariot -4,
attributes sea_faring,hide_forest,cantabrian_circle,very_hardy
formation 2, 2.5, 6, 6, 6,square
Then open data\descr_model_battle.txt and look for, again, for "hippotoxotai". If it is not there you should add the proper entry. This is the one I have, but beware as it is for the mod_switch install of RTRPE so I do not know if it will work with your install:
Code:
type hippotoxotai
skeleton fs_hc_archer, fs_hc_swordsman
indiv_range 40
texture dacia, RTRPE/data/RTR/models_unit/textures/ABC_unit_dacia_hippotoxotai.tga
model_flexi RTRPE/data/RTR/models_unit/ABC_unit_hippotoxotai.cas, 15
model_flexi RTRPE/data/RTR/models_unit/ABC_unit_hippotoxotai.cas, 30
model_flexi RTRPE/data/RTR/models_unit/ABC_unit_hippotoxotai.cas, max
model_sprite dacia, 60.0, RTRPE/data/RTR/sprites/dacia_harchers_sprite.spr
model_tri 400, 0.5f, 0.5f, 0.5f
Of course, you must check that the files referred in this entry are located in the proper folder.
If you are not using the mod_switch version of RTRPE, just let me know and I will give you the proper DMB entry.
Concerning the problem with the interface, I think that Arbaces' Heirs of Atlantis also had a pack file with interface in it. Maybe that is what is causing the problem..