Big black marks after rendering DNxHD Codec after using some effects, using Eos Mark III footage on FCP7

Dear All,
I hope you can help me. Working on an IMac with FCP 7. It's the first time that I am using footage shot with Canon EOS Mark III. I did not expect this to be such a problem as it was almost impossible to edit with the footage, as I kept on getting the beach ball and then it would crash. Finally fixed the problem by downloading the DnxHD Codec and was able to do a rough edit on a compressed timeline to make the job faster and show a rough cut to the client.
Now I am trying to cut an HD version, where I'm using the same footage with matched timeline settings and when I don't do anything and render it, it looks fine. The minute I use an effect (e.g colour correction or a simple crop) and render, I literally get big black blotches or marks all over the image. Any advise on where I should look to fix the problem?
Many thanks!
Amanda

Convert the footage to ProRes LT before editing.
Your camera shoots H.264 and Final Cut Pro does not like that one bit.
You can use FCP's Log & Transfer function to do this (you might need to install a Canon Plug-in first) or you can do the conversion in Compressor.

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