After updating to 18.104.22.16821, the embedding of PDF documents does not work anymore. If I drop a PDF on an empty note, it will show the + cursor before the drop, but nothing is visible in the note after the drop. The funny thing is that a miniature of the first page of the PDF will show up in notes list as shown in the attached image. This behavior is the same if I open the note on the web version of Evernote.
I have included the info for the note. It shows "1 PDF has not been indexed", which means it did read the PDF.
I did read a comment that the PDF can still be shown in a separate window by choosing the "Always show PDF documents as attachments". This has no effect in my case.
My system is Windows 7 with all updates applied.