Cannot add media to WordPress post

Hi, I'm having an issue with adding Media to a Wordpress post.
When I select Add media button the only thing that happens is that the url changes from
/wp-admin/post.php?post=1055&action=edit
to
/wp-admin/post.php?post=1055&action=edit#

no dialogue box with images appears. I have tried this on several browsers, and different machines. It has been tested on wordpress 4.0 and the previous version. I have tried with all plugins deactivated.

I am using theme Clockstone.

(I was looking to change theme, but need to do a backiup first and this is proving problematic.)

Any suggestions
Simon CrippsOwnerAsked:
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Jason C. LevineNo oneCommented:
Check your browser console (or firebug or similar) to be sure but you are probably seeing the result of a JavaScript conflict preventing the media dialog from popping up.

Try switching themes anyway (it doesn't hurt anything) to one of the default WordPress themes (TwentyWhatever) and see if things persist.  If they do, the problem is probably a plugin.
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Sam CohenConsultant to Digital/DeveloperCommented:
try disabling your plugins and then see if it works. Then try upgrading wordpress if you haven't already.
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Simon CrippsOwnerAuthor Commented:
It appears to be the clockstone template. If I change the template I am able to make the changes, then revet back to clockstoke. what a pain.
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Simon CrippsOwnerAuthor Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for Simon Cripps's comment #a40354041

for the following reason:

it worked
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Jason C. LevineNo oneCommented:
My comment has the answer: "Try switching themes anyway (it doesn't hurt anything) to one of the default WordPress themes"

Now that we know it's the theme, the proper troubleshooting steps involve going through the theme javascript and disabling it to see which script is conflicting.
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Simon CrippsOwnerAuthor Commented:
Apologies Jason, yes that is the correct solution
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Simon CrippsOwnerAuthor Commented:
That works
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