A red frame indicates a damaged frame of video. Or rather Premiere sees it as damaged, and changes it to red. I have seen this from time to time when recording HDV onto a Sony HARD disk recorder, although they tend to be in the middle of a long recording. Fortunately for me the image the camera records is fairly static, so I can freeze the previous frame over the red frame, so hiding it.
Since the video is DNxHD, I wonder if this has been transcoded from another file format? Maybe the error occurred in that process.
Well I have had success. It seems like my OWC enclosure's ESATA and Firewire800 don't play nicely with my PC. when I moved the RAID enclosure to my MAC and then shared the drive with my PC over ethernet, red frames gone!
Hopefully this will help any others that might be having this problem.
So it looks like an issue with the MacDrive software on your windows machine. Maybe the software is slowing down access to the files on the HDD, as a result of it being formatted in HFS+. Why not format the HDD in exFAT? That provides Mac and Win compatibility. The only issue with this is that you need a recent Mac OS, whereas exFAT is supported back to win XP.