D3 stuck at updating tools
Even if that's not an ideal solution, it would at least be helpful to know whether that makes any difference.
The links displayed correctly in Chrome 26 (this was my sort of control test), but didn't display at all in IE 10 (as expected).
If anyone can find a work-around for the marker issue itself, that would be better, and it should additionally be posted as an answer to the other marker question.
(Also note: My solution makes dashed links look terrible, so I've made them light blue instead.) This bug has been reported to Microsoft, but so far they seem to have denied or ignored it. What this little piece of wonder does, is go over all the link nodes every tick of the animation, and re-add them to the DOM.