Ok,
I got a reply on forums.cpanel.net.
-----The cPanel error log should let you know the reason for this failure. Could you check to see if there are any specific error messages listed in /usr/local/cpanel/logs/error_log when you encounter this problem?
In most cases, this is the result of the cPanel process not having enough memory. In "WHM >> Server Configuration >> Tweak Settings", under the "System" tab, could you try increasing the following value:
"Max cPanel process memory"-----
I am not sure if the second option it offers will work,
if not,
maybe you will have to check the log,
and I'll post it on again.
http://forums.cpanel.net/f5/cant-fetch-per...les-209532.html
Oh,
By the way,
this topic can be merge with http://www.helionet.org/index/index.php?showtopic=9308
Thanks!