I've got a science fort that has separate burrows for each group of test subjects (to keep them from forming relationships with test subjects in other group, or with the staff). I discovered that dwarves will not bring an injured dwarf to a hospital if the injured dwarf is in a burrow that doesn't include the hospital. So I had to add the hospital to each test group's burrows. Now I get test subjects travelling from their group area, all the way down to the hospital, and just hanging out there. They're not doing any job in the hospital, but apparently since it's in their burrow, they can just idle there. This, despite the fact that there is a dining room/meeting hall in their group area. I think I need to just add a separate hospital in each test group's area.
I also get a ton of cancellation from dwarves trying to haul stuff to a destination outside of their burrow. I'm not sure exactly what is going on, but I think they take a hauling job for an item that starts in their burrow, but needs to go someplace outside the burrow. Apparently they don't check for the destination before taking the job, so they don't realize it violates their burrow, and once they get the item, they have to cancel. At least that's my guess on what's going on. It's really annoying.