I play with the latest version of all the games (DA:1.80g.100, TA:0.96[b].005).
My system specs are :
Geforce 8800GTX (latest drivers)
Core2duo E6600
2GB RAM
HD : 320GB 7200tpm
Motherboard : P5B deluxe Wi Fi
OS : Windows XP SP2
I found bizarre that the picture of the minor races were so stretched :

So I made a test : I renamed the 393x256 pixels picture with the name of the equivalent at 256x256 ::

I think the result is clear, the game uses the 256x256 picture instead of the larger one in the trade screen.
I hope I help.