5D III always defaulting to SD card?

[soundsubs]

hello group.
I'll bet someone has solved this. I searched here and elsewhere and couldn't find a permanent solution.

When I load and use ML (recent build, less than a month old), for some reason it tends to use the SD card instead of the CF card. I want to load the ML firmware off of SD card, and use the CF card for video.
I've tried in Card Settings using the Card Test, CF card workaround, and Preferred Card (CF) but it still wants to write to the SD card (which it can't handle so there are tons of frame skipping)

[Audionut]

Install the latest build.

[soundsubs]

Wow. This worked! Thank you!
And now sound!
And now a clacker!
...and!