You need to increase your max_input_vars setting on your web server to at least 2,000. Not to worry if this sounds daunting, it's actually a very easy fix, and your web host can do it for you if you don't know how - just ask them. You can also refer to this link to increase this setting yourself: http://stackoverflow.com/questions/10303714/php-ma...
Note: If you are using a one-click script-installed WordPress installation (rather than their official WordPress installation instructions) such as GoDaddy or similar, you will potentially need to edit a different file to increase your max_input_vars variable. Here is their knowledge-base article regarding this file:
In your site root (commonly the public_html folder) you must create the php.ini file and add the following lines to it:
max_input_vars = 5000
suhosin.post.max_vars = 5000
suhosin.request.max_vars = 5000
Additional help: The following is from an Engine user who still had issues with the spinning loader but was able to get it working via the following:
If you were migrating your database or complete site from WAMP 2.0 and/or using the “all-in-one-wp-migration” plugin, the following steps might be necessary:
1) Clear out your WordPress database via phpMyAdmin on your web server (drop all tables so it's empty).
2) Export your local database
3) Import the database to your web server
4) Don't forget to assign correct user for the DB you are migrating (your DB username on WAMP2.0 is most likely "root" and password is blank. It must be changed.)