I too have the same issue www.richardparkes.co.uk
i have tried unpublishing the s5 modules
i have tried upgrading to the new latest joomla version
I have deleted all the files and re-installed
i have deleted the database and re-installed
i have been with you guys now for a few years and this is the first time i have replicated the problem as outlined in the opening post of this topic
what other fixes are there? or ways around this issue?