Edit bar gone missing on some PCs

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Hi,
I have a strange problem with the edit bar.
We built a site for a client on c5-6.2 who has been using it and editing content for months. He uses Firefox & IE on Windows 8 at his office and safari on a mac at home and had no problems until recently. Now when he logs in there is no edit bar but he is shown as logged in.
If he goes to site.co.uk/dashboard he can log in and is served the dashboard where he can go to a page, visit it, edit it & save the edit but when he clicks Return to site, the edited page is shown correctly but the edit bar is missing.
We have tested the site on Linux & Windows with Firefox, Chrome, IE and on Android with Chrome and it works correctly, i.e. shows edit bar, every time.

We have tried:
- clearing the browsers' caches
- clearing the site cache
- turning off all cacheing
- checking that the lines
<?php   Loader::element('footer_required'); ?>

&
<?php   Loader::element('header_required'); ?>

are present and in the right place.
I don't know what to try next.
Any suggestions?
Thanks

briggers
 
JohntheFish replied on at Permalink Reply
JohntheFish
As you see it all in your systems, you need to view the site from other systems that are not on your local network and have not previously viewed the site or been involved in its development. Ideally on your clients systems. Look at what happens with the browser developer console or firebug running. It could be showing a missing script or a script error.