MP3+ USB External Card doesn't work when plugged into USB

My MP3+ USB external sound card doenst' work whenever I plug it into my usb hub.
Model: sb0270
First I tried a powered D-link 7 port usb 2.0 hub. (model DUB-H7, H/W ver: 2) although the model number doens't tell you much is has the same model number as a USB/Firewire hub with 3/4 ports.
The sound card is recognized as a "composite" device. But no sound goes "through" it (light doesn't flash).
I'm now using a Belkin 7 port usb 2.0 hub, model f5u237 rev. 3.
When I plug the soundcard into my computer it stops the laptop speakers, and then my sound system starts playing. When I unplug it my sound system stops, and then my laptopspears start playing. When I plug it into the USB hub the sound on my laptop speakers stops, windows finds a USB composite device, then the sound starts playing on my laptop speakers again.
I've tried this on 2 computers a HP ZV600 and a HP dv5040us.
dv5040us specs: http://h0025.www.hp.com/ewfrf/wc/genericDocument?cc=us&docname=c00584686&lc=en&jump id=reg_R002_USEN
This is the only USB device I have that is not functioning correctly. (2 HDDs, keyboard, mouse, printer, mp3 player, controller, and joystick)
Even if those arn't plugged it it still doens't work.

I tried with another USB flash card and with a smaller file.
The transferring from Mac to the card starts but is extremely slow ( around 0,5MB/sec)

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