One problem with using gridify when placing extracted pages is the page sequence is wrong. For instance, a 20 page document is placed in the sequence 1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 2, 20, 3, 4, 5, 6, 7, 8, 9. The problem seems to be that Acrobat exports the pages as 1-20 when it needs to be 01-20, in other words there needs to be the same number of digits for each number in the sequence. I tried experimenting with the prefix options when exporting from Acrobat (Document > Split Document) but couldn't find anything that worked. As a workaround you could use a utility to rename the extracted pages sequentially before placing. (I made a workflow in Automator, which comes with Mac OS X).
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