K-only shadow –> 4-c on PDF export

[thomaso]

In a 4-c document a shadow defined as K only gets converted to 4-c color on PDF export. – Attached two PDFs (print-preset , preset X-4).

v183 shadow 100K_1.7.pdf

v183 shadow 100K_X-4.pdf

Since this problem was reported by Serif today as possibly solved in v183, I link to a corresponding thread.
This K-only effect/multiply issue was reported quite a few times since pre-retail beta versions, this is just a more recent thread:

 

[BigStef]

Hi @thomaso, thanks for this topic. 

I actually got around this problem by not using the "Shadow" tool for my 4C documents, but by duplicating the layer and assigning it a color K with a blur + multiply. It would be my pleasure to use "Shadows" again with version 1.8.3 if this was corrected. It's so much more… easy and practical