There is a problem with disc 4 of the Tylor DVDs.
People are understandably upset.
This chapter is NOT on the disc and there is no way to access it indirectly, so we will have to replace the disc. The check disc was correct, so it came to us as a surprise that there was a problem. Please note that the problem was discovered on Saturday, so it took us a bit to trace backward until we figured out what happened. No action is required on the your part, other than to watch your mailbox for the replacement. Please see below for timeframe.