Theme causes Admin ajax to stop working

Any javascripts or the use of reserved names in the theme’s functions.php file.

I have nothing in my functions.php but it is possible that I have something in some of my template files. Where can I find a list of WordPress reserved names?

I am getting this error in my web developer toolbar when I try to add a new custom field, which is where the problem happens.

Error: XML or text declaration not at start of entity
Source File: /wp-admin/admin-ajax.php
Line: 2, Column: 1
Source Code:
<?xml version=’1.0′ standalone=’yes’?><wp_ajax><response action=’add-meta_1477′><meta id=’1477′ position=’1′><response_data><![CDATA[

I have this problem too. No javascript or name conflicts in functions file.

It ended up being my functions.php file like esmi said. I misspelled something in my register_functions function. Try taking everything out of your functions.php, save it… test the problem and then you can just put it all back.

For me it also was the functions file. I had a filter that limits the excerpt. This was the trouble maker… Now I use a excerpt editor plugin.