I’m having somewhat of the same issue. My problem is that I have multiple clips in a timeline that all come from the same source, lets a say a one camera interview, and so with the selects made from that one video file from the one source, Davinci keeps saving each little edit as the same name. Thus resorting in a timeline with the same interview select over and over and over for the duration of the video. Is there a way to fix this? I have “Render each clip with a unique filename” and that works if each select is from their own source file, but not if multiple edits are from one source file (i.e. BMCC_001.MOV) and cut up into the timeline.