Overprint is not maintained after making PDF - separation files are not correct
When using spot colors to overprint, the PDF files show knockouts in Acrobat. For example, when overprinting a 10% black square over a Pantone square, the result is a knockout, even though the attributes are set to overprint.
When correcting for this I tried the Transparency feature to make a 10% gray, but the result is an overprint with a screen for each plate where the overprint should occur. (see attached image) The only correct plates were produced by printing a postscript file and using distiller to create the plates. This did not happen is previous versions.
Clif, is this still an issue for you?
I just tried to reproduce it, and separations look correct in Acrobat if you export a document with a pieces colored in a Pantone and a shade of overprinted black over it.
Can you please confirm this or refute?
Also, what preset were you using when exported your file?