Wondering if anyone has same problem. Create a file, Save. Load, run, quit. All looks good.
Go back to make another of same job, file has vanished. Now back to design, bring up file, and get message, “Only C2D files are supported”, which it shows to be, which it ran 1st time~!
Where are you saving the files? With what permissions?
What filename are you using?
Are there any accented characters involved? If so, try again, placing the files in a filepath which does not have any such characters, and using a filename which is plain, 7-bit ASCII (A–Z, a–z, numbers, maybe a hyphen)