I was doing tagged accesible PDF using the latest CS5.5. I tagged 2 different documents the same way but one of the PDFs came back with the cover image not having an alt text (through running full check). This is really strange because both documents have cover images and in both docs, I tagged them the same way.
I used Object Export Options... and entered alt text to Alt Text tab and Tagged PDF tab.
Both images already have XMP description so I used that. But one of them worked and the other didn't. So I entered Custom alt text to the problematic image. But still it wouldn't work.
I'm puzzled because I have used the same steps and method in tagging these covers and only one has issue. Does anyone have any idea why it would happen?