Cannot use more than one chart on a page

Hello,

I've been tearing my hair out trying to find the source of this problem in the code but have been defeated so am filing this here.

Basically when calling a chart programatically it appears the data series is being stored somewhere. When creating a new canvas object on the same page, the series object from the last one reappears and is added onto the graph. If you have 4 or 5 graphs on a page the display gets very crowded as each additional graph appends the new data to the last graphs data.

Using different object names for $canvas doesn't appear to help, nor does unsetting the last $canvas or $canvas->series.

This problem occurs with both Bluff Charts and Open Flash Charts, I haven't tried AmCharts.

Thanks,
Jonny