The title says it all. After reading some more about intermediate codecs, I decided to download GoPro Studio to see if cineform worked better than DNxHD on my computer. I generated "the same" file using both GoPro Studio and Resolve. The file created by GoPro Studio plays on Hitfilm, but the Resolve one gives me an error. I tried several different levels of compression and the results were always the same (as in, the file would not play on Hitfilm). The Resolve one plays well on Resolve.
Here are the files if you want to check.
Suggestions are welcome.