Realtime graphs have stopped working.

[Vard0]

Hi.

My realtime graphs are no longer working for some reason. Ithink it may be after a PHP upgrade.

My httpd log reports the following:- ERROR: opening '/var/www/html/cache/xxx.rrd': No such file or directory,

If I run the poller manually with "sudo -u apache php /var/www/html/plugins/realtime/poller_rt.php" it does create the graph, but it has NAN values when viewed through realtime.

I've tried the suggestions of this post . http://forums.cacti.net/viewtopic.php?f=14&t=49378 . but it doesn't appear to make any difference.

I'm running Cacti 0.8.8b, Realtime 0.5 and php 5.3.3.

Any pointers would be greatly appreciated.

Thank you