Currently Being ModeratedFeb 7, 2013 6:41 PM (in response to Tim Van Damme)
Did you import these files previously? If so, you must reprocess them within Aperture.
Choose all the RX1 files and choose Photo->Reprocess Original and tell it to reprocess them all. Then, as if by magic, they should show up.
Currently Being ModeratedFeb 7, 2013 9:05 PM (in response to William Lloyd)
No I tried to import them today (just received the camera). Currently running all the RAW files from the camera through Image Data Converter (transforming them into TIFF files) and then into Aperture.
Currently Being ModeratedFeb 7, 2013 9:47 PM (in response to Tim Van Damme)
Run SW update to install Digital Camera RAW Compatibility Update 4.04 which added the RX1. It was released today, 7 Feb 2013. Or click the link and download the update for a manual install.