- edits to the DW post will go through to the LJ post, unless you've edited the LJ post in the mean time (which breaks the connection).
- user names with an underscore: change it to a dash and it will work.
- if you leave your 'problems with DW' posts (eg the one about not being able to add and LJ community) public, someone from DW will likely wander by and tell you the answer / whether it's planned - they're very good like that.
- I think that the latest status is that xposts with filters don't work - the LJ version will be the next level of security up. They were working on it, though, so it might have happened.