If you have saved it with Preserve Illustrator Editing Capabilities ticked, you should have a full AI file contained in the PDF, otherwise it is the PDF part only.
Is there a recent version you can fall back on?
What happens if you File>Place the PDF in a new document with Paste Remembers Layers ticked in the Layer palette flyout/dropdown (and remember to untick it afterwards)?
no recent version to fall back on,
I can only open one page at a time in illustrator_
and when saving it only saves this one page.
PDF document has all 12 pages_
On Thu, Jan 15, 2015 at 11:18 AM, Jacob Bugge <email@example.com>
I believe the best way to rebuild is to select and open each additional PDF page in a separate AI document, then Ctrl/Cmd+A Ctrl/Cmd+X and switch to the new working document and Ctrl/Cmd+F into a new Layer.
Obviously, you may lose some of the finer structures and editability, depending on the nature of the original artwork, but at least you hopefully have some original artwork and something to build on, one way or another.
You are welcome, groupie.
Crossposting, I was writing an edit, as follows.
It is always safest to save (copies of) versions underway, and to make copies away from your work folder (and preferably also the harddisk/computer) regularly, preferably at least once a day. To choose what suits you best, you may think of whichever mishaps may occur, including unfortunate file operations, sudden loss of power, (any kind of) breakdown of harddisk(s), and (some of us are silly enough to consider) serious external events.
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There is a solution. If you can still see all your pages in pdf, extract one of them as separate page and then open it in AI. It will open your original AI file with all artboards.
I used pdf Split and Merge program, but you can just extract.
This worked for me!! (I had the same problem) Thankyou SO much!!