It still did not work for me. Opening up capture properties would always say "NTSC" no matter what I set them to the previous time, and I always saw a black screen.
Set the following registry key to "Full Access" for apps and normal (non-admin) users:
The problem appears to be a bug in the Decklink DShow filter which requests R/W access to a registry key under HKLM. Since opening the key failed with ACCESS DENIED, none of the other "preference saving and loading" activity worked either.
"Legacy" apps will work OK since they use the Vista/7/8 registry virtualization (graphedit.exe falls into this category) but newly created WPFMediaKit apps will not.
Running elevated did not resolve the problem for me - only changing the permissions on that node.