In Vegas 7 you are able to drag (lengthen) out a clip and preview the footage that you are dragging out in realtime - like the slider follows the end of the clip. Vegas used to do it by default, and it was very handy when lengthening or shortening a clip as I could see exactly where to lengthen it to and what I was adding on, but for some reason Vegas has just stopped doing this "drag previewing" and I have to drag the clip out (or lengthen it) and then select the new parts of the clip with the slider to actually preview what I just added. I'm just wondering if this command has a name and if it can be toggled on and off as it seems to have been toggled off.