Hello,
We’re generating PDF Reports via JasperReports Framework, which uses iText 2.1.7 for PDF generation. The PDFs include images.
It works fine for many years.
But recently we faced a problem with Adobe Reader on Android Tablets: instead of the integrated Images a ..red rectangle will be shows as!

We noticed the problem for the first time with the Version 17.5.180092, and it still exists with the current version 18.2.0.182935.
(The Reader 17.0.* displays the PDFs correctly)

Displaying the same PDFs on all other platforms (Windows, iOS) with newest Reader Versions works without problems.

A deeper investigation revealed that the reason is based in the PDF structure generated by iText:
A XObject Element contains the images as Subtypes with Form types
/Type XObject
/Subtype Form

We are grateful for any help.

Best regards
Christof