2014: Default Export to PDF location is no longer the last folder exported to

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So when I used to export to PDF, AutoCAD would open the explorer window and it would be open in the last place I exported to (e.g. My Documents). If I export more than one sheet in one job, I want them all in the same folder, so once I'd exported one PDF sheet, I could then export all the rest to that same folder quickly (e.g. if one was exported to My Documents\[Job Number]\PDFs, all subsequent export commands would open that file path by default, as it was the last path used).
I don't know what I've changed, but now when i export to PDF, it *always* opens to an old file path that I haven't used in ages.
How do I set it back to "default export location = last location used"?
I know there is a way to do it, oithers have spoke of it: http://www.cadforum.cz/forum_en/forum_posts.asp?TID=7812