Scott,
Sorry, I couldn’t tell from your message. From reading your message it would seem it was working one day then not the next. Does that sound right?
Reinstalling the drivers is not a bad idea, but before you do that make sure the settings in the control panel are right.
So click Apple -> System Preferences -> Decklink. Under output make sure the setting is set to component. Here is the trick. There was a bug recently (just fixed in 6.7) that caused the settings in the control panel to become de-synced to the board. So basically the control panel says one thing, but the board is doing another. So to fix this toggle the output setting and change it back. See if that works first.
If not, download the 6.7 drivers from our website. Run the double click on it. Run the uninstaller, then run the installer afterwords.
If it still isn’t working, give us a call here at the office.
Sincerely,
Joshua
Director of Support
Blackmagic Design Inc.