My intial guess is that it might be the Mixer FX feature. There is an effect that can become engaged when you move the EQs, and it sounds as though you might've adjusted one a tiny amount (just enough to engage it). I would suggest disabling this. To disable Mixer FX: 1) In the menubar, select Window, then Mixer FX (this will open the Mixer FX window). 2) On the Mixer FX window, disable all of the pink and yellow buttons.