http://projects.blender.org/tracker/index.php?func=detail&aid=2707&group_id=9&atid=125 Problem was as suspected (axismtx defined after clearing constraints), so very easy to fix.
http://projects.blender.org/tracker/index.php?func=detail&aid=2707&group_id=9&atid=125 Problem was as suspected (axismtx defined after clearing constraints), so very easy to fix.