I bought a plugable USB 2.0 4-Port Hub with Battery Charging Function from Amazon on April 6, 2013 to use with a Raspberry Pi. It works fine for supplying power to the Pi, but it has never worked for any other USB peripheral devices. Initially I only used it for power because I did not have a Male-A to Male-A USB cord, but once I aquired one (and some extras from Monoprice) no USB devices I tried worked. I tried usb thumb drives, logitech wireless mice and keyboards,wired usb mice and keyboards. Nothing. Today I tried it with my home pc and and a wired mouse and it did not work. I then tried a much older power hub and it worked fine. My conclusion is that the pluggable hub is, unfortunately, defective. Any suggestions?
An additional note, all the ports on the hub work fine for powering the Pi. It just seems that anything that transmits data fails.