Anything you can do to help us reproduce this would be appreciated.

Is this another case of a conflict fight, or something else?
  http://wiki.darcs.net/index.html/ConflictsFAQ
for more details

It's also worth considering if there are other non-conflict-related factors
involved.

We should also see if we can make any more progress in documenting the kind of
things that make darcs2 still hang, and ways to avoid them, or to work around
hanging situations :-/  They should be much rarer, and I hope we (well, David et
al) will continue to make progress, but in meantime, we need to make sure folks
like you are up and running.