roboRIO usb

[Merfoo]

Hello I'm trying to use a usb hub on the roborio to increase the amount of usb cameras we can use as well, the problem I'm having is that I can't get the images from the camera when it is plugged into the usb hub. I have tried two usb hubs, one that was powered from 5v and one that was not. The camera shows up on the roborio web interface when plugged into the usb hub that is NOT powered by a 5v but I'm still not able to get images from it in java. You guys have any ideas what could be happening? (Sorry if I threadjacked)