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I've seen this happen from a misconfigured .htaccess file. If you have one in your site's directory try temporarily renaming it to see if that solves the issue.

casidougal wrote:I've seen this happen from a misconfigured .htaccess file. If you have one in your site's directory try temporarily renaming it to see if that solves the issue.

Nah its definately a hack - How they managed to insert some extra code into the index.php file is a mystery to me tho

Not doubting you. However, in the case someone else finds this thread and restoring their index.php does not solve the problem it might be helpful for them to also try temporarily disabling their .htaccess since that too can be a cause of the same problem.