Ingar, Thanks for your answer.
You mentioned that you had no problems with very huge pictures. Perhaps it has to do with the kind of compilation? I compile with pdflatex. Maybe I should use another compilation but I'm afraid of (small) changes in hyphenation or in the very critical positions of my pictures on the page layout. *** In the meanwhile I have reorganised my file structure so that I've got less but larger files. -- No change. Than I grouped pictures (in these larger files) and set the latex option "draft mode" of all pictures in one of these large files. -- This helped!! I can now produce all my material in two runs where I set alternatively pictures of two different large files to draft mode and combine the two pdf files of these two different runs of compilations with Adobe Professional to one book file. -- Not very comfortable but I hope it will work for the publisher. I think this change with pictures in draft mode is another clue that I ran in memory problems because of my problems. Peter
