No Graphs displayed in Cacti

[bemystified]

Hi
I am very new to Linux and have installed Cacti on my Fedora Core 2 PC
I can log into Cati and can add devices too , the snmp of which are picked too but no graphs are displayed in the Graph view
Even when i try to graph the traffic/ CPU load for the local host, there are no graphs displayed.
The path for rrdtool has been checked and its correct and so is the php path

[GrammatonCleric]

check the permissions within you cacti directory (i.e. /var/www/cacti). Make sure that user that cacti runs as has permissions to rra directory.

[action09]

Doing a :
[cactiuser@box rra]$ ls -lah
total 4.9M
drwxr-xr-x 2 cactiuser users 4.0K jui 28 11:02 .
drwxr-xr-x 11 1000 users 4.0K jui 28 12:33 ..
-rw-r--r-- 1 cactiuser users 92K jui 28 13:15 box_supervision_hdd_free_36.rrd


permission on *.rrd are, as you can see 644 do i need to enable exec on it ?
i.e. 755 ?

Thanks

[action09]

for my case it was the poller: cmd.php now named poller.php i had to put the new name in crontab.
I was doing an upgrade from 0.8.5a to .8.6f