Created attachment 20348 [details]
A pdf file, with annotations which are displayed misplaced by poppler.

Poppler seems to interpret the coordinates of annotations
in the coordinate system originating at the bottom-left corner
of the crop-box whereas acrobat (and, it seems, the pdf spec)
interprets them as originating at (0,0) of the user space, i.e. 
the "real" (0,0). This results in the fact, that in files with a cropbox set, the annotations appear misplaced (viewed in okular, using the latest
git checkout a6f5032ab0d6edbf3879f39efff7916b1f7233da of libpoppler) when compared to the same file viewed in acrobat reader. For an example, see the attached pdf file.