I am one of the people who have a dovetail and a bottom plate that don't fit. My dovetail is a machined piece and the bottom plate a cast one. They seem to fit alright but put the camera on a tripod and there is so much play that when I grab the top handle I can move it sideways about one centimeter. It just doesn't feel safe.
Rather than complaining in the forum I emailed RED and asked if I could send it back. I got an answer that RED is aware of the problem and working on a new dovetail. I asked if I could exchange my dovetail for the new one but got an email today that it needs to bought rather than replaced.
I am very disappointed in this policy of RED. I am one of the early believers and am now being punished by having to buy a replacement for accessory that that I bought but doesn't do what is it is supposed to - place the camera firmly on a tripod. And what happened to the one year warranty?