Q: The videos in my playlist do not seek to the correct position at start. What am I doing wrong?
A: Apparently, some videos don't support the "seekTo" command, due to the way the video was encoded. As a result, the video will need to load all the video data up to the seek position before it can play. In other cases, the video is encoded with rough seek positions, so that "seekTo" will put it kind-of close to the expected position, but not exactly.
The player should auto-detect if a video doesn't support auto-seek to a non-zero start position. If you find that your video is this type, then you'll either need to re-encode it and post it yourself, or find a different video. Sorry!