I've had 5 clients this week tell me that they cannot open the .pdf's I have created in Corel Draw. I have tried the Save As function, the Export Function, and the Publish to PDF function, and there doesn't seem to be a difference for the clients.
Other posts have suggested using a different program to open the files, but I have not control over what a client uses to open them.
I am running Corel Draw 2017 ver. 19.1.0.419, on Windows 10 Pro ver. 1709
what are your pdf settings?