I had told dwarves to cut down trees in an area a good distance away from my base, across a river. After doing so they left the wood lying about where the trees had been, despite the fact that my wood stockpile was empty. I even tried creating another stockpile nearby to see if they brought the wood to that.

Things I've checked

* I do have dwarves with the wood hauling labour enabled.
* The area is accessible
* I have not told dwarves to stay within any burrows, or created any for that matter.