Hi,
I actually have the same problem. When clicking “Graphs and Stats” in the plugin settings menu, I get this error message;
Runners Log - Stats and Graph
Below the graphs you'll find the code you need to use in a page, post or template to insert a simular graph as shown.
Warning: Invalid argument supplied for foreach() in /home/<PATH>/wp-content/plugins/runners-log/pChart/pChart.class on line 3289
Warning: max() [function.max]: Array must contain at least one element in /home/<PATH>/wp-content/plugins/runners-log/pChart/pChart.class on line 3300
Fatal error: Cannot use string offset as an array in /home/<PATH>/wp-content/plugins/runners-log/pChart/pChart.class on line 395
I suspect that this is because of the lack of example data during the plugin install, and as such, only existing users are able to use the latest version.
As a sidenote, I use PHP 5.2 on this server. Not sure if that makes a difference for your plugin.