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“CPU/Memory/MySQL Usage” showing blank cPanel: 

This is a common error in all cPanel versions, The main cause of this error is related to the utility that produces the statistics in cPanel.

When cPanel is installed, several entries are added into crontab for the root user. The following is a list of the default crontab entries from a cPanel server,

root@iserversupports13 [/etc/cron.hourly]# crontab -l
0 6 * * * /usr/local/cpanel/scripts/exim_tidydb > /dev/null 2>&1
30 5 * * * /usr/local/cpanel/scripts/optimize_eximstats > /dev/null 2>&1
2,58 * * * * /usr/local/bandmin/bandmin
0 0 * * * /usr/local/bandmin/ipaddrmap
18 3 * * * /usr/local/cpanel/scripts/upcp --cron
0 1 * * * /usr/local/cpanel/scripts/cpbackup
0 2 * * * /usr/local/cpanel/bin/backup
35 * * * * /usr/bin/test -x /usr/local/cpanel/bin/tail-check && /usr/local/cpanel/bin/tail-check
45 */4 * * * /usr/bin/test -x /usr/local/cpanel/scripts/update_mailman_cache && /usr/local/cpanel/scripts/update_mailman_cache
30 */4 * * * /usr/bin/test -x /usr/local/cpanel/scripts/update_db_cache && /usr/local/cpanel/scripts/update_db_cache
45 */8 * * * /usr/bin/test -x /usr/local/cpanel/bin/optimizefs && /usr/local/cpanel/bin/optimizefs
30 */2 * * * /usr/local/cpanel/bin/mysqluserstore >/dev/null 2>&1
15 */2 * * * /usr/local/cpanel/bin/dbindex >/dev/null 2>&1
15 */6 * * * /usr/local/cpanel/scripts/autorepair recoverymgmt >/dev/null 2>&1
*/5 * * * * /usr/local/cpanel/bin/dcpumon >/dev/null 2>&1 
11 2 * * * /usr/local/cpanel/whostmgr/docroot/cgi/cpaddons_report.pl --notify 
3,18,33,48 * * * * /usr/local/cpanel/whostmgr/bin/dnsqueue > /dev/null 2>&1 
4 0 * * * cd /usr/local/cpanel/whostmgr/docroot/cgi/fantastico/scripts/ ; /usr/local/cpanel/3rdparty/bin/php cron.php > /dev/null 2>&1 
44 23 * * * /usr/local/cpanel/3rdparty/bin/freshclam --quiet --no-warnings

In that the cron below compiles the logs for the Usage page,

 */5 * * * * /usr/local/cpanel/bin/dcpumon >/dev/null 2>&1

and this is set to run every five minutes, every hour.

So for solving this issue you need restart the crond. For that run the command,

/etc/init.d/crond restart
root@iserversupports13 [~]# /etc/init.d/crond restart
Stopping crond:[OK]
Starting crond:[OK]
root@iserversupports13 [~]#

This will fix the issue.