TROUBLESHOOTING: Drivers installed but video card not seen (Blackmagic-Design drivers 12.2 or later)

What is the issue?

In some case, a video device is not seen even though it seems to be working fine and drivers are installed. The issue is most probably related to a security in macOS that require you to allow system extensions (kernel extensions or DriverKit) to load. And in some cases something goes wrong with this verification.

The issue and resolution will be different if you are using a driver using DriverKit or a Kernel Extension (kext).

• If you are using drivers from AJA or Deltacast, or if you are using older Blackmagic-Design drivers (12.1 and earlier), these are using a Kernel Extension, and the troubleshooting is explained in another article.
• If you are using a recent version of the Blackmagic-Design drivers (12.2 or later), these are using DriverKit, should be much simpler to use, but there are still some potential issues. Read more below.

HOW to fix this?

As explained above, if you are using a recent version of the Blackmagic-Design drivers (12.2 or later), they are using DriverKit, and should be much simpler to work with.

But we have seen some cases, particularly after a macOS upgrade (for example from Ventura to Sonoma), that the card would not connect, below are some ways to address this. If it still does not work, get in touch with Blackmagic-Design support.

Uninstall and Reinstall the drivers

Sometimes it seems that macOS won't ask you to authorise the driver to load. To force the macOS to ask you the autorisation, a simple reinstall will not work, you will have to run the uninstaller first.

• Check which version of the drivers you have installed: 
  • Open Desktop Video Setup
  • Go to the menu "Desktop Video Setup > About Desktop Video Setup"
  • Check what is said in the About window.
• Make sure to have downloaded the installer for that same version. Download them again from Blackmagic-Design's website if needed.
• Open the DMG image, and you should see the uninstaller:
• Run the uninstaller.
• Even if it does not ask you to, restart your computer.
• Then install again the drivers.
• Make sure that you allow the system extension to load in "Privacy & Security". This is the important step, if you don't allow them to load, you won't be able to use your Blackmagic-Design device.
• 
• Restart your computer.
• That should be it... at least it worked in some user cases.

Uninstall and Reinstall the drivers

We have seen other solutions, explained by a user in a Blackmagic-Design forum. Here's a copy of what he explains in the forum, note that we did not test that specific case:

• Connect the UltraStudio devices to your Mac with a Thunderbolt 3 cable or higher
• Open Desktop Video Setup
• Navigate to this location in the Finder: Macintosh HD (or the name of your hard drive) → Library → Application Support → Blackmagic Design → Blackmagic DeckLink
•  In the list, locate the Terminal script called DesktopVideoHelper and double-click it. The script takes under a second to run. Once it is complete, the connected UltraStudio devices are shown in Desktop Video Setup.
• Close the Terminal window (it's OK to terminate the processes that are running)

Please note that this is not a permanent, one-time fix. If your M1 / M2 Mac doesn't find your connected UltraStudio devices on its own when you open the Desktop Video Setup app, you will need to run the script every time you use this app. 

(Source: Fredrik Matheson -  on Blackmagic-Design forum)