Ah, nice catch, perhaps

$mcr_crtime_chart->ChartTitle->{Text} = "MCRByURN-CreateTime";

Should be:

$mcr_crtime_chart->ChartTitle->{Characters}->{Text} = "MCRByURN-CreateTime";

Sometimes if find it difficult to find things via the msdn search, and I have never been a huge fan of the Microsoft documentation.

It may also be worth checking out the URLs I link to in this node.

Martin