No Graph - RRD graph of CP
RRD Graph of Captive Portal
Concurrent users - No Graph
Total logged in user - Graph OK
Already tried reset RRD Data
Please see attachment.
Same problem for me : pfsense 2.1-RELEASE (amd64)
Graph works in previous version (2.0)
Check the forum/tickets/commits - There is a fix for this, it was broken in 2.1-RELEASE, it will be fixed in 2.1.1 but the fix can be applied manually to get it working now.
Thank you very much it's working now.