I’ve had problems with the same thing too, even after installing the new plugin etc.
By accident I got it working with one single scene file, but not any other. So now if I want to export the camera data etc. I have to make a copy of that one file and then replace the scene contents with my new scene! And then it works again!
I think it’s got something to do with file hierarchy, because sometimes the export doesn’t work if I export it into certain directories or hard drives.