Unable to run dynamiccobemap with X1950XTX

It seems torque does not support any kind of cubemaps in next generation videocards such as radeno 1950XTX. i've tried to make a shader using dynamiccubemap. it didn't worked. however i did changer the cubemap with a cubemap structure made of simple *.PNG files. it still doesn't work. what seems to be the problem using cubemaps with this videoadapter. the same application runs perfectly on radeon 9800XT.
my shader simply does not work with the new videocards. once again i repeat that this shader works perfectly on radeon 9800XT. what seems to be the problem? i appel this to the torque developer team. i need answers. if i decide to make a game one day and this game runs on radeon9800XT perfectly how you explect i can make this game run perfectly on most of the computers ,having in mind that it doesn't work on X1950XTX???