I've joined the ranks of many who are unable to set featured image or have other multiple and strange issues with adding media when updating to 3.5.1
I have tried deactivating/activating plugins, etc etc
(I've now deleted all but Akismet and Share This)
I've gone thru this post and its list:
No such luck
I DID have BulletProof security at one time, yes I de-activated it and deleted it.
As per instructions:
Note: You can still have this problem if you have *ever* used the BulletProof Security in the past, even if you have removed it. If you are experiencing problems with menus and widgets and the editor and similar not working, and you have ever used BulletProof Security, even if you're not using it anymore, then look for an .htaccess file in the /wp-admin directory, and delete it if it is there.
However, I cannot find an .htaccess file there?
I've tried to debug via browser
Now, here's something interesting.
In FireFox Error Console, when it's running and I try to Set Featured Image, I get the following:
Error: junk after document element
Source File: http://mysite.ca/wp-admin/admin-ajax.php
<div style='position:absolute;margin-left:-99999px;'>This text shows the supremacyBed Bath and Beyond Coupons of conjucting the creativity of working in group with the same spirituality of compromising that which icon pop quiz is called as an alternative power of freedom and happyness.whats the word answers In case you like our work,Citalopram citalopram side effects you should adhere what Omeprazole Side Effects Omeprazole we love to call as logos quiz answers office depot coupons beteks, the specific word named after <!-- btst --></div>0
In the admin-ajax.php file, none of that shows up.
Perhaps this is causing the Add Media/Set Featured Image problem? Either way I'd still like to remove it, and I hope it fixes things in general.
I'm wondering if I download a fresh copy of 3.5.1 and upload a fresh admin-ajax.php file - will it affect anything else on the sight (functionality or design?)
Any help or advice would be greatly appreciated