Roms not working with usb encoder/dragonrise but with the keyboard is okay?

[StandardShaun]

Hello,
Any ideas why dragonrise joysticks on usb encoders should differ from a usb keyboard? When the keyboard is connected the roms work okay when I connect the joystick/buttons they config okay and work at the main menu but as soon as I load a game it fails to start (loads black screen for a few seconds then back to main menu).

Any suggestions would be much appreciated!

[Zing]

@standardshaun Hello!
On which board are you running the system?
Never worked or stopped working? If it stopped working, what did you do before it stopped working? If it never worked, what assures you that the usb encoder / dragonrise is working, ie what ensures that it is not the usb encoder that is in trouble?