Hi Karl,
Thank you so much for reporting this.
The problem is that in STV's internal architecture, an SCDateCell does not have a detail table view model, and thus the variable "detailTableViewModel" actually contains "nil". We will modify this architectural decision in our new 2.0 release (due in about 1 week from now) to allow you to customize SCDateCell's view controller, just as you did in your code sample.
Thanks again!