If you currently have an SSL certificate for this particular domain, try adding the following to your wp-config.php:
define('FORCE_SSL_LOGIN', true);
define('FORCE_SSL_ADMIN', true);
If that isn’t the issue, there could be some script concatenation issues or something else entirely. Try the following next (the second will display some debugging information on script loading):
define( 'CONCATENATE_SCRIPTS', false );
define( 'SCRIPT_DEBUG', true );
It was an SSL/mixed content issue.
Don’t know why as I have used the same install many times with no problem.
Sorted now, thank you.
Shane
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