Hi Bodo,
did you ask a similar question as “Abanob” or is that a coinsidence?
Anyway, as far as I know RC only supports scans that have individual stations. The reason is that RC creates little cubes where all the points are converted to 6 images. If you use a complete scan with no such stations, I guess it gets confused. Also, your points need color information so that the images can be aligned to them.