Answered
Since Chrome update Adobe extension won't open fill-able PDFs. IE works fine still, and plain pdfs work fine.
Asks for update, on latest Adobe versions (whether it be Reader DC or Acrobat)
Removing extensions and re-adding hasn't work. 
Asks for update, on latest Adobe versions (whether it be Reader DC or Acrobat)
Removing extensions and re-adding hasn't work. 
It's been a while yes. You may not have run across any XFA forms until now. It's not that the Reader plug-in for Chrome doesn't support them, it's that Chrome doesn't support the Reader plug-in and uses its own viewer.
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