I've just reverted the code in graphlib, so all core graphs should go back to working now.

What I was trying to do was resolve an issue for some-one else at the OU who had used $graph->parameter['y_tick_labels'] rather than the way Jamie has defaulted the values above. She's on maternity leave so sadly I can't ask why! I've altered her code to match Jamie's instead so the contrib module should work now with the core code - which is better.

What I wonder though - and why I'm not closing this yet, is whether we should add to the class init to default offset_relation and y_tick_labels to null, rather than expect every new graph() to do it?

Thanks for fixing this.

My +1 to set default properties of class graph :

var $y_tick_labels = null;
var $offset_relation = null;

Jamie

//following two lines seem to silence notice warnings from graphlib.php
$line->parameter['y_tick_labels'] = null;
$line->offset_relation = null;

Anymore.