"Automatically attached associated PDF" is not working

"Automatically attached associated PDF and other files when saving items" is not working. It looks that it is saving the PDF very well, and it is an icon for PDF and under that a snapshot attachement. When I click on the PDF attachement in My Library, it comes up a PDF viewer, but with a totally black screen inside. I have Zotero 4.0.11


The shapshot attachement is working but if I scroll down in the snapshot attachement I get a suddenly changed webadress zotero://attachment/22/?np=y where the ?np=y is new, and in the screen it stands "File not found".
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