Denied access to SharePoint Foundation 2010 Site Master Page

I am trying to edit the Site Master Page in SharePoint Designer, but get the following error message

I am the farm & site Administrator and SharePoint Designer has the rights to change the Site Master Page

I get the same message if I try to Edit the Master page at Top Level.

Why am I wanting to do this?

To try some customisation of the Quick Launch Bar i.e. To add flyout menus to the headings.

Thanks for viewing
Neil RandallAsked:
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Jamie McAllister MVPSharePoint ConsultantCommented:
Have you checked the above settings both at the Site Collection Level and Application Level in Central Admin?

 Central Administration --> General Application Settings --> Configure SharePoint Designer Settings.
Neil RandallAuthor Commented:
Checked Jamie - see image in the question above.
Jamie McAllister MVPSharePoint ConsultantCommented:
I see the image but I asked if it was checked in both places. Central Administration AND Site collection level.

One setting could override the other., and it's most logical explanation for the behavior
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Neil RandallAuthor Commented:
Thanks Jamie

Central Administration --> General Application Settings --> Configure SharePoint Designer Settings.
I only have these settings, one of which is to allow administrators to customise Master Pages. There is no distinction between site collection level and application level, apart from the URL (top right) which is the top level site. It doesn't give me the option of changing this to the child site I want to change the Master Page for, i.e.

Jamie McAllister MVPSharePoint ConsultantCommented:
Thanks Nelmo.

Just one more thing, could you send me a screenshot of this page for completeness?

Neil RandallAuthor Commented:
Thanks Jamie

This is looking like the cause of the problem.

Shows these options

Should I have enable customizing master pages and layouts ticked here for the child site I want to use and also have that option ticked in Central administration?
Jamie McAllister MVPSharePoint ConsultantCommented:
You need to tick the option here for your Site Collection as this is overriding your Application wide setting in Central Admin.

You need it ticked in both places...

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Neil RandallAuthor Commented:

Thanks Jamie

I can now open the Site Master Page in SharePoint Designer.

Just one final question, the answer to which may be obvious but just to make sure. The Site Master Page that I am customising I find in the Site Settings - Galleries - Master Pages of my test site http://sharepoint.oursite/test_site/_layouts/SharePointDesignerSettings.aspx

Is this the Master Page for the test_site only?
I just want to make sure that changes I make to this site do not affect the parent site

Thanks again
Jamie McAllister MVPSharePoint ConsultantCommented:
Hi Nelmo,

Yes you're editing the local Masterpage, not the one for the whole site.
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