dr dmd is right, it's normal for the sheath to dry up at this point in development. It may take the plant a while to bring all those blooms to maturity but when it does what a show it will be! Awesome growing! I never get tired of seeing this cross. Looks like the very top bud is starting to color up a bit.
Here is the first bloom of my catt it isn't bloomed out all the way but hey I couldn't wait. Can't seem to get the right angle or color but what the hey.