Unknown USB Device connected

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Hi, I was wondering if anyone else had this problem...

I'm developing an application that controls custom hardware over USB. I've been testing on a Xoom where it works fine, but I recently bought a Galaxy 10.1 to test compatibility. The application runs fine but when I connect my custom USB device to the tablet it says "Unknown USB Device connected"

Other USB devices work fine such as mice and USB flash drives on the Galaxy, so I believe there's nothing wrong with my adapter.

Application details:
My application has a USB_DEVICE_ATTACHED intent filter with my device's device/product id specified in the corresponding device_filter.xml file. When I plug my device into the Xoom, I get the expected prompt asking if I would like to launch my app. On the Galaxy I get no such prompt, it just says unknown USB device.

Any ideas? Thanks in advance.