Recently we noticed an issue with our DarkMart and trying to find out a way to avoid it. Until we take care of it, you can use this patch.
Information about the error:
The joomla security causes the problem.
The Virtuemart Component in the QuickStart has been installed to Virtuemart by using the username: "admin" and it's ID was 500.
but when you were performing Akeeba Backup to install the QuickStart package, you generated your own "super administrator" username, and to prevent the conflict problem, this username gets a new ID (instead of 500). This is the source of the problem. The ID must have been 500. But it became something different.
The easiest way to solve lt. Follow my instruction:
Open your Joomla database using PHPMyadmin tool.
Open "#__users" table,
Find record with "Super User" name and click on edit icon,
Change Super User id value to 500 and click "GO" button,
#__users is right here: (the 5 letters at the begining in your PHPmyAdmin is going to be different)
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After clicking the EDIT icon for "super administrator" user, you are going to enter the ID as 500
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Did you get the specific error message above?
JUser: :_load: Unable to load user with ID: 500 ??
It can only happen after a successful Akeeba install.
"More information about this error may be available in the server error log." - have you looked?
This is a standard Akeeba install used by 1000's of users - if Akeeba won't run on your machine (check your logs) Akeeba's site has extensive trouble-shooting steps on their site - it is the standard way to install or move a complete Joomla install with the minimum of effort..