Over at the Daz forums a user has discovered the reason why Genesis 8 expressions don't work with Genesis 8.1. Apparently placeholders were slotted in the 8.1 morph files that disable expression cross-functionality with Genesis 8. When these placeholders are removed G8 expressions will work with 8.1. Speculation on the forums is that they serve no other purpose other than to disable G8 expressions being used on G8.1, so as to sell G8.1 expressions some say. Note that G8.1 is just an update to an existing model and not a new generation. Daz Corp better come up with as acceptable explanation because ill-feeling and speculation is growing on their forums.