Connector doesn't move with objects

This seems similar to other reported bugs with connectors.
When connectors are attached to sub-objects of a group they don't move when the group moves.
This is very basic in that I'm trying to simulate ports on signal processing blocks that can be interconnected.

So---
  Create 2 rectangles.
  Create 2 small circles, each touching an edge of one rectangle - creating a "terminal" or "port" on each block.
  Create a connector between the two circles.
  Create 2 groups, each consisting of one rectangle and its associated circle.
  Drag one group. The connector doesn't move (appears disconnected).
  Drag the other group. The connector still doesn't move.
  Ctrl-click one circle to select (while it's still part of its group).
  Slightly change its size. The connector now gets redrawn correctly.

An svg of the above case is attached.
The XML looks neat and appropriate to my relatively virgin eyes.
This seems so elementary that I hope I'm not wasting your time.

Inkscape 0.48.4 r9939
Win 7 64bit