Did you try the etransmit as Kirk suggested? I have never tried that, but it's worth a shot.
Another thing to test; since you said the export normally works, but not on certain drawings. Copy/paste everything from the drawing you need into a new drawing from your template. Save, audit. Try to export to acad from there.
Credit where credit is due! Give kudos or accept as solution whenever you can.
Start with some of our most frequented solutions or visit the Installation and Licensing Forum to get help installing your software.