I've been trying to install Munin for 15 days, I looked for information, analized logs, I even deleted and reinstalled Munin using YUM. I'm hosted at Media Temple on a VPS with CentOS. The problem is still there and It's driving me nuts.

Graphics are shown as following:

http://imageshack.us/photo/my-images/833/capturadepantalla201106u.png/

This is the configuration of my munin.conf file

dbdir   /var/lib/munin
htmldir /var/www/munin
logdir  /var/log/munin
rundir  /var/run/munin

[localhost]
    address **.**.***.*** #IP VPS

This is the configuration of my munin-node.conf file

log_level 4
log_file /var/log/munin/munin-node.log
port 4949
pid_file /var/run/munin/munin-node.pid
background 1
setseid 1

# Which port to bind to;
host *
user root
group root
setsid yes

# Regexps for files to ignore

ignore_file ~$
ignore_file \.bak$
ignore_file %$
ignore_file \.dpkg-(tmp|new|old|dist)$
ignore_file \.rpm(save|new)$

allow ^127\.0\.0\.1$

Thanks so much, I appreciate all the answers

UPDATE munin-graph.log

Jun 22 16:30:02 - Starting munin-graph
Jun 22 16:30:02 - Processing domain: localhost
Jun 22 16:30:02 - Graphed service : open_inodes (0.14 sec * 4)
Jun 22 16:30:02 - Graphed service : sendmail_mailtraffic (0.10 sec * 4)
Jun 22 16:30:02 - Graphed service : apache_processes (0.12 sec * 4)
Jun 22 16:30:02 - Graphed service : entropy (0.10 sec * 4)
Jun 22 16:30:02 - Graphed service : sendmail_mailstats (0.14 sec * 4)
Jun 22 16:30:02 - Graphed service : processes (0.14 sec * 4)
Jun 22 16:30:03 - Graphed service : apache_accesses (0.27 sec * 4)
Jun 22 16:30:03 - Graphed service : apache_volume (0.15 sec * 4)
Jun 22 16:30:03 - Graphed service : df (0.21 sec * 4)
Jun 22 16:30:03 - Graphed service : netstat (0.19 sec * 4)
Jun 22 16:30:03 - Graphed service : interrupts (0.14 sec * 4)
Jun 22 16:30:03 - Graphed service : swap (0.14 sec * 4)
Jun 22 16:30:04 - Graphed service : load (0.11 sec * 4)
Jun 22 16:30:04 - Graphed service : sendmail_mailqueue (0.13 sec * 4)
Jun 22 16:30:04 - Graphed service : cpu (0.21 sec * 4)
Jun 22 16:30:04 - Graphed service : df_inode (0.16 sec * 4)
Jun 22 16:30:04 - Graphed service : open_files (0.16 sec * 4)
Jun 22 16:30:04 - Graphed service : forks (0.13 sec * 4)
Jun 22 16:30:05 - Graphed service : memory (0.26 sec * 4)
Jun 22 16:30:05 - Graphed service : nfs_client (0.36 sec * 4)
Jun 22 16:30:05 - Graphed service : vmstat (0.10 sec * 4)
Jun 22 16:30:05 - Processed node: localhost (3.45 sec)
Jun 22 16:30:05 - Processed domain: localhost (3.45 sec)
Jun 22 16:30:05 - Munin-graph finished (3.46 sec)