I suggest you take a step-by-step route: Try to create a simple 10s Interop DCP from a still image, no audio, no extras. Format a USB stick to FAT32 using the Macs Disk Utility. After DCP-o-matic finished creating the DCP, select ‚Show DCP‘ unter Jobs - the DCP folder will be highlighted. Copy only this DCP folder (not DCP-o-matics project folder) to the USB stick, then try to ingest on the GDC. - Carsten