Motorola ROKR Z6m

Im having a problem with multimedia txt with my rokr. For instance a txt that you get that would rotate through several pictures as its playing a song I can hear the song but it wont change to the next pictures it just stays on the first one. Same thing if you go into the templates in your messages and click on multimedia templates and click on running late how it shows the rabbit running if I send it it shows up on the other phone with the rabbit running but if its sent back to me its still. Im sending this to other US Cellular customers on the same account and its working fine on their phones. Can anyone help fix this problem??