Using Blender 2.66, at some point, I realized that selecting a vertex in edit mode (3D view) doesn’t highlight the beginning of the edges that are linked to it anymore (I mean: the orange highlight that fades away around midway into the edge).
Adding the end vertex of one of those edges to the selection completely highlights the edge as expected, so I don’t think that my geometry is broken (and by the way not seeing those highlights anymore initially led me to believe that I had managed to rip a few things apart by mistake !)
Is there possibly an option or hotkey that I might have activated by mistake? (note that I am a fairly recent user to the tool)
Following the steps above has not changed the observed behavior.
The model is available at: http://www.pasteall.org/blend/19989 (just going through the manga character modelling tutorial at CGTuts)
Here are screenshots:
In addition to the above, I opened a new file and checked what was happening with the default cube at the center of the geometry. And there it looks just fine indeed: http://www.pasteall.org/pic/46917
Right. It’s just the way vertex selection shows when you have mirror modifier applied during edit mode. It’s one of the display modes on the modifier header.