[xep-support] Accessible PDF errors

I've rendered a PDF from XEP 4.9 using -DENABLE-ACCESSIBILITY=true. When I
open this PDF in Acrobat Professional 8.1, everything seems fine at first,
but when I navigate away from the first page and then return to it, Acrobat
displays this error:

"An error exists on this page. Acrobat may not display the page correctly.
Please contact the person who created the PDF document to correct the
problem."

When I click OK, the following message is then displayed:

"Wrong operand type."

From that point on, the first page of the PDF displays blank.

At least one other page in the document also displays the same two errors
when it is first displayed.

If I simply open the file, then insert a new page at the start of the
document (Document > Insert Pages. > Select a JPG file > Before First), then
attempt to add accessibility tags to the document (Advanced > Accessibility
> Add Tags to Document), I get this error:

"Acrobat was unable to make this document accessible because of the
following error:

"Bad PDF; invalid loaded page.

"Please note that some pages of this document may have been changed. Because
of this failure, you are advised to not save these changes."

Any advice or help would be appreciated!

--
Kevin Yank
Technical Director, SitePoint Pty. Ltd.
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