The only picture we have inside the toc is the one I attached to this posting.
But I think that the picture is not the problem because we get the pdf document without error.
And my analysis showed that between the the download of the pdf and the crash were roundabout 50 minutes. So I think that the problem lies in the fact that the PD4Device with its related java resources were kept for that time frame, but the related native resources (profile data) were gone.
I would suggest to dispose the second PD4Device too.