do any codes work for you? like the camera code maybe usb loader is not readng any codes for you this happened to me once using usbloadergx i had to write my codes in txt format and than convert them to gct using usbloadergx bfore it recognized my codes u have to do some playing with it if this your case
I use usb loader gx and never had a problem using codes and what not.
gct file goes in Codes
txt file goes in txtcodes
plug that sh*t in
What i always do tho is just edit the txt file adding the new codes or deleting whatever and on gx click on brawl open ocarina check whatever codes click create and BOOM
for more people reading this was just a waste of youre time :p