Intensity Pro does not require any proprietary codecs at all. We simply capture to the standard 2vuy codecs as per Apple's Uncompressed 8-bit codecs and that's what is configured as the capture format when you select an uncompressed Intensity easy setup in Final Cut Pro.
I began running the Intensity Pro somewhere around release 3.1. Based on the advice on your own website, I built my sequences using Blackmagic 8 Bit (2Vuy) and NOT Apple's built in codec. Ever since 3.3 your codec (2Vuy) seems to have been eliminated from the lineup.
Just to prove my theory I recently downloaded the 3.5.1 drivers. Again, no sign of the codec I used to build my sequences. If I now open up my Final Cut project it will give me an error that says "Codec Not Found. You may be using a codec without the corresponding hardware." Beyond that, it won't even open the specific timeline of those sequences. If I try to double click them, I get a memory error.
I repeat, there is NO Blackmagic 8 bit codec in the lineup for the Intensity Pro. I only get Blackmagic RGB 10 bit. I bought this product for editing uncompressed 8 bit.
So it appears my only hope it to switch back to 3.2, swap out every single sequence with a different codec and then re-render. Then re-upgrade the driver? Sorry, but that's just poor.
And wasn't your 8-bit codec supposedly better than Apple's, and without the questionable support for HD? Again, I got this from your site.