Workaround for splines=ortho crash?

Hi,

An issue has been reported by several users in which for some graphs setting "splines = ortho" causes dot to crash. See for example issues

http://www.graphviz.org/mantisbt/view.php?id=2152
http://www.graphviz.org/mantisbt/view.php?id=2248
http://www.graphviz.org/mantisbt/view.php?id=2258

Does anyone have a workaround for this issue?

Thanks.

The first two are related and

The first two are related and have a workaround. See the note I've added to 2248.

The last still needs to be worked on. It's nasty and I don't know of any general workaround.