
Although I have been unable to reproduce the corruption (yet), I sort of remember what I was doing at the time. I was using the Drag MIDI feature of Plugin Boutique Scaler to drag a chord progression into a fresh Scratch Pad I had created in Studio One. I remember after releasing the mouse button, it looked like the MIDI clip had not been created. I repeated the drag-n-drop operation again to a different track in the Scratch Pad, and then if I remember correctly the timeline auto-scrolled into the infernal reaches of Studio One: crazy-high bar numbers in the thousands that actually became negative numbers as you continued to scroll to the right. When I found the MIDI clip, it was a bit of a challenge to get it back to the bar numbers at the front of the timeline. Attempting to use the mouse scroll wheel and the track rewind button to get back to the front of the timeline was like fighting equilibrium; very frustrating to deal with.
I only mention this whole incident because I think that this timeline corruption may have exposed how the Scratch Pad feature is actually implemented in Studio One. It would seem that the Scratch Pad bars exist in a timeline continuum that would normally be unreachable in the regular timeline; the crazy bar number starting locations would normally map back to the bar one origin. I think that the actual starting bar number increases for each Scratch Pad that is created. For example, Scratch Pad #1 might actually begin at bar# 32768 in the timeline; Scratch Pad #2 might begin at bar# 65535; Scratch Pad #n might begin at bar# -268435456; etc.
I will attach a ZIP of a severely pared-down version of the corrupted Studio One project; it may not still be corrupted anymore.