here is what I tried today :
- Updated all plugins
- installed php5-curl on our server
- WP_DEBUG was showing few plugins using 'wp_deregister_script( 'jquery' );' :: fixed that
- Another plugin was using split() :: fixed that
Couple of things I noticed :
- On the server error log we get this error : Request exceeded the limit of 10 internal redirects due to probable configuration error. Use 'LimitInternalRecursion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace.
- Also admin.ajax.php gives the 500 error and points to load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils&ver=4.1 (in firebug)
