In the new 2018 update: When publishing to PDF, the results do not include bitmap images. Acrobat displays an error message saying that an error exists on the page and that it will not display correctly. Any bitmap is not displayed. Another 2018 bug.
I just did a 199" x 42" document with 17 high res images to PDF with no issue.
David, just occasionally consider that telling people that you DON'T have their problem is actually not helping.
If I'm not having any issues then they may want to look at their settings. There have been no reported issues of this anywhere except here. If they inquire further I'll get into it however most times they figure it out and never post back so I'm not going to waste my time going through a long time consuming process.
I'm afraid other people are experiencing issues with 2018 exporting to PDF. Multi page documents aren't publishing properly, missing pages (thread to CDGS 2018, Big PDF problems) and an image I sent as a PDF to the sign printer a few days ago reversed the colours of 2 bitmaps - as if they were photo negatives. The settings and presets are identical to those I have in X8, which works perfectly.
As I said I'm not having any issues and I do sign work every day. Can you post the offending CorelDraw file for me to download and look at please?
You can use a drop box service or something, post a link here or send to firstname.lastname@example.org