I am having same problem,
have attached a screen shot.
here is the error again:
file_put_contents(/home/surfingj/public_html/cms_j/templates/ja_purity/index.php) [function.file-put-contents]: failed to open stream: Permission denied in /home/surfingj/public_html/cms_j/libraries/joomla/filesystem/file.php on line 298
this is line 298 $ret = file_put_contents($file, $buffer);
Even though it says that it
failed to open stream: permission denied
failed to extract archive
when you navigate back to the control panel and check the site it in fact has updated the site, well at least Joomla thinks it has.
I have done this on two sites now with same result.
site seem to function correctly.
any ideas?