DJM V10-LF beatfx settings not saving

I recently bought a v10-lf. Extremely happy with everything but... I can't figure out how to make saving beatfx settings work. I set them in settings menu, on the beatfx themselves and then try and save to usb. Whenever I turn the mixer back on for next session (and of course press load beatfx), the settings are back to default. Am I missing something the manual doesn't tell me?