For a variety of reasons you may want to temporarily prevent MC from interacting with your Blackmagic decklink card. In our case it prevents us from opening 1080P projects because the card is older and only supports 1080i. It also causes problems if you try to consolidate/transcode or apply timewarps to 1080P clips. Hitting the disable hardware button within MC 6.5 does NOT resolve these issues. You may have seen this message:

AME Resource Manager: ReconfigHW_LegendBoB_play()Error (2147483656) unable to: SetVideoFormatBlk.

Here is how to temporarily disable the BM card and prevent MC from interacting with it (without uninstalling the drivers)

Open TextEdit and choose Format>Make Plain text

Then paste this code:

#!/bin/bash

sudo kextunload /System/Library/Extensions/DeckLink_Driver.kext

Save the file as: Disable_Decklink.sh onto your desktop.

Then open Terminal and type: chmod 777

before you hit enter, drag the Disable_Decklink.sh file onto the terminal window (this will fill in the path to the file) and hit enter.

Now whenever you want to disable the BM card just open the Disable_decklink.sh using terminal and enter your system password. Then open MC and you should be in full software only mode.

To re-enable the card you simply need to redo the steps above to make a Enable_Decklink.sh by using the following code instead:

#!/bin/bash

sudo kextload /System/Library/Extensions/DeckLink_Driver.kext

Please note - this workaround has not been fully tested and may be unreliable. 

Enjoy software only mode folks!!!