I've been testing 2.0 with the registered Heretic wad and it works great.
So I thought I'd test out the Heretic Treasure Chest wad.
I ran DD and brought up the command line and attempted to load the wad, but I got a segvio error and DD shut down. I'm able to load a .pk3 file ok, but not a .wad. I even tried loading the heretic.wad file and still got the same segvio.
I also tried putting the htchest.wad file in the folder with the others, and used the "Select IWAD Folder" menu option to scan the folder again but it ignored that wad.
I just wanted to let you know in case you aren't already aware as I know the new DD UI is still in development!