[wp-trac] [WordPress Trac] #23409: Featured Images Not Working when From Media Library

[WordPress Trac]

#23409: Featured Images Not Working when From Media Library
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 Reporter:  saracup                    |       Owner:
     Type:  defect (bug)               |      Status:  new
 Priority:  normal                     |   Milestone:  Awaiting Review
Component:  Media                      |     Version:  3.5.1
 Severity:  normal                     |  Resolution:
 Keywords:  needs-testing needs-patch  |
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Comment (by saracup):

 I am in 3.5.1, Multisite, all plugins disabled, using Twenty-Twelve theme.
 While editing a post, when clicking on "Set Featured Image" in the meta
 box, I get the popup and select the image. I then click "Save Featured
 Image." The box closes. The meta box displays nothing -- just the original
 "Set Featured Image" link. So, I Update the post. Still, no featured
 image.

 Going through the above steps, I decide instead to upload an image from my
 computer. When I do, and select it as my featured image, it works.

 It seems to choke only on files that are already in the media library.

 Using the backtrace-error.php file, I go to the media library. My
 thumbnails are blank, and there is an error on every image. The error
 refers to "wp-includes/capabilities.php." and is worded, for each image,
 as follows:
 Backtrace from warning 'Trying to get property of non-object' at /[my
 server filepath]/wp-includes/capabilities.php 1075:
         1.      calling map_meta_cap()
         2.      /[my server filepath]/wp-includes/capabilities.php 926
 calling call_user_func_array()
         3.      calling has_cap()
         4.      /[my server filepath]/wp-includes/capabilities.php 1289
 calling call_user_func_array()
         5.      /[my server filepath]/wp-admin/includes/class-wp-media-
 list-table.php 306 calling current_user_can()
         6.      /[my server filepath]/wp-admin/includes/class-wp-list-
 table.php 796 calling display_rows()
         7.      /[my server filepath]/wp-admin/includes/class-wp-list-
 table.php 736 calling display_rows_or_placeholder()
         8.      /[my server filepath]/wp-admin/upload.php 240 calling
 display()

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Ticket URL: <http://core.trac.wordpress.org/ticket/23409#comment:1>
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