Images not rendered correctly following recent Acrobat Reader update

Within the last week we have had the same issue reported by two unrelated customers.  In both cases embedded jpg images within PDF documents (used to include either a company logo or a stationery form) are failing to be rendered correctly when opened by some of their third-parties, appearing large and blocky (as if compressed or rendered at very low resolution) covering the text content and resulting in PDF documents being unreadable.  In one case the PDFs are purchase orders being sent to suppliers, and in the other they are invoices being sent to customers, so this is a very significant issue.

Nothing had changed in either of the sending company's systems, however, based on other support tickets from the last week that I have seen, it appears that the issue might be occurring when the recipients of the PDF documents have applied a recent Acrobat Reader update.

Could someone confirm that this serious bug has been acknowledged by Adobe, and that it is being treated as a matter of urgency?  In the meantime, is there a known workaround that can be applied by the company that is preparing the PDF documents?  It would not be practical for us to request that every one of our customers contact all of their suppliers and customers, to ask that their staff manually apply an update.