Unable to publish to slide library and MOSS

I cannot publish slides to a slide library I've created.  I've checked permissions on the slides - I have full control.  I have full control on the site collection and I am a farm administrator.

When I select upload, select the slide show to upload the slides appear stacked vertically - as they should.  Select all, Publish.
I get: http://mysite/subsite/slide_library_name is not accessible.  Either the location does not exist or you might not have permissions to use this library.  If I go to explorer view and drag the slides in I get  'An error occurred copying some or all of the selected slides'.

I get no errors in the Event Viewer.
I've tried this in several slide shows in different locations.
Where should I look to troubleshoot this?
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xmouserAuthor Commented:
I have multiple site collections and I cannot upload any slides to a slide library that I've created to test on.
xmouserAuthor Commented:
I'm also getting 'File Not Found' under SIte Actions > SIte Administration > Content and Structuer/Content Structure and Logs.
xmouserAuthor Commented:
Using FQDN in alternate acces mappings gave me the ability to upload PP to a slide library.

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