hello , pendrive , mouse or keyboard run well in my n900 but

i bought this usb hub
http://www.soyntec.com/us-en/item/nexoos_395_black

and i tried and tried with charger o without charger and only with one thing , for example only hub+mouse or only hub+keyboard

and nothing , and well?? i saw a quake 2 video in youtube with hub with mouse and keyboard .

if my mouse and my keyboard run well in hen without hub , only one conected

and my mouse and my keyboard normally are using with low speed mode , it is more compatibility in theory

why with hub are not running , ???

any idea?? thanks for hen