I have installed the Avid Codecs LE and made sure the files are in the Program Files (x86)/Quicktime/QTSystem folder. Vegas Pro will not import the DNxHD MXF files from Blackmagic Design Hyperdeck Shuttle. What am I doing wrong?
I have a Hyperdeck Shuttle, too. You need to use the AVID DNxHD Quicktime format. Vegas will read those files... Also, if you have Quicktime installed (even the free, non-Pro version), you should be able to read the ProRes files created by the Hyperdeck Shuttle.
The only problem I have had with Vegas and AVID DNxHD files in the latest version of Vegas Pro 12 is that it would start to fail when I had too many files on the timeline. Just a heads up.
Also, if you need to transcode the files you already have, you might try downloading Davinci Resolve Lite. It can render the DNxHD Quicktime files, too (as well as other formats/codecs).