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Hay All, when i run the auto-update for WordPress 3.1 it doesn't do anything.

It says

Downloading update from http://wordpress.org/wordpress-3.1.zip…
Unpacking the update…

But then the browser stops, it leaves a 3 megabyte "wordpress-3.tmp" file in my wp-content folder.

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try manually – ntechi Feb 24 '11 at 11:20
turns out php's "safe mode" was an issue, having it on didn't allow the .zip file to decompress. – dotty Feb 24 '11 at 11:55
hi there, i'm having the same problem - except i'm a complete noooob and don't know what php's safe mode is? any clues please? – user3607 Mar 1 '11 at 9:45
@jules-whiteway It's a server setting that a host may use in the belief that it might make the server more secure. If you are having issues with updates check your web hosts FAQ's or ask if safe_mode is used on your server. – Elpie May 10 '11 at 16:18

For the sake of this not haunting unanswered questions...

WordPress tries its best to deal with filesystem/permission issues when updating and requests access credentials if necessary.

So many issues in this department are more likely to be caused by hosting configuration, rather than WP itself. In this specific case PHP safe mode was causing issues, which is not suprising given that it is deprecated feature, discouraged to be used by PHP developers.

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