MyTouch Slide 3G USB connection with Pioneer Radio.

[jhook32244]

Hi guys. New to the Android world. I have a Pioneer AVHP3200DVD with USB input. When I plug my Mytouch Slide 3g the radio will read format however it will not display the music files or pics. It just stays on a loop. I tried with my son's phone the Samsung Behold II and it does the same thing. However when I plug in my other son's Blackberry 9700 Bold it will display the files and play the music with no problem. Does anybody know is there a compatability issue with the radio or phone? The phone charges fine when I plug in the radio's USB port. It will not read the files. HELP..... Thanks