Was there any follow up on this from Squarespace? I just discovered I'm having the same problem, regardless of video background, regardless of codec, regardless of YT upload resolution or export resolution, it hit's full buffer in the same point in the video (likely that 6 second spot op described). Can anyone explain what's going on here or how we can avoid this? There has to be some sort of navigation around this to pre-buffer 1080p, or lock it at 720p so you don't get those jarring resolution switches.
Thanks in advance.