When I try to export to new PDF file, the file downloads but won't open. I get a Fatal Error, could not connect to DDE server. What does this mean?
[Moved from the Lounge (which is where you can "connect with your peers" from across all of Adobe's products for conversations that don't directly relate to help and support) to a product-specific support forum - moderator]
I assume you are using Reader to convert files to PDF.
Would you please try to convert the files via web browsers https://cloud.acrobat.com/convertpdf and let us know if that helps.
This might be temporary issue.