Which web browser are you using? Have you tested this with more than one? You might want to clear out all the temporary files from which ever web browser is giving you trouble uploading images.
If your dashboard issue anything like mine – http://wordpress.org/support/topic/installed-38-and-cant-view-screen-options-change-featured-image-in-post-view?replies=9 –
the solution I came across might work for you.
TLDR;
(from post at http://wordpress.org/support/topic/installed-38-and-cant-view-screen-options-change-featured-image-in-post-view?replies=9)
——–quote——-
WordPress Fix – Add Media Button Not Working
Basically you’ve just updated your install of WordPress and bang! The Add Media button doesn’t work! What to do?
Never fear, Carnfield is here – with a fix!
Basically you need to open your “wp-config.php” file in the root of your WordPress Install.
Search for this line:
require_once(ABSPATH . ‘wp-settings.php’);
And just before it add this code:
define(‘CONCATENATE_SCRIPTS’, false );
Now your WordPress Install should be fixed!
I’ve tried using many browsers but all showing the same issue. I mainly use chrome (on mac) but have switched to Safari, and even ie10 and firefox on a pc but get the same issue.
i’ve tried adding the code above and i am now a little better off than before. I am back to a situation where the Add Media box comes up, but it is blank. There is no option to “upload files” or “media library” which are usually the tabs at the top (well they are on my other wordpress site). The only option i have to add media seems to be to add from URL which does bring up the dialog box for the address.
Just as an FYI, i can add media up onto the site using the media section of admin – just the media isnt available then to add to the pages or posts.
Sorry, it’s over my head, but you might take a look at this post and see if your host can help you out. http://wordpress.org/support/topic/cannot-add-new-media-since-38-upgrade?replies=15
