Visitors: No Data to display

[Matt R]

I've been using Slimstat now for a few months, and overall its been
really useful.

However, whenever I visit the 'Visitors' tab, the graph there always
shows 'No data to display'. However, the other boxes on the page show
useful information that seems to indicate regular visitors, and I'm
seeing 'human' search terms etc being used.

Any ideas what might be causing this?

Thanks,

Matthew