Sorry to highjack such an old thread, but I am having this exact problem within Cubase 8. The track volume fader within the arranger window on any multi output track jump up in increments of +1dB when you click on the volume control, until it resets to no volume at all, and then it becomes inactive as a control. The weird thing is, the volume faders within the mixer work fine. Was this confirmed to be a bug? Anyone know if it’s fixed within later versions of Cubase?