Hi there! I double-checked, and you are listed, and should be able to gain access to the DD Gallery. Here's how:
Click on Gallery.
In Gallery view, you'll see
Member Galleries. . . then
Dirty Dozen Designs
convention 04
contests
all sets separated into chunks of the alphabet
etc, etc.
Click on Dirty Dozen Designs, and you'll see the galleries for all of the challenges to date.
Enjoy, and thank you for supporting splitcoaststampers!