I was attempting to export my custom types from the Types Plug In and the plug in kept downloading an empty ZIP file. After unsuccessful attempts referencing http://wp-types.com/forums/topic/export-types-data-downloads-empty-zip-file/#post-115496 and http://wordpress.org/support/topic/sys_get_temp_dir I found http://wp-types.com/forums/topic/problems-exportingimporting-types-definition-on-multisite/. I am not running a multisite environment but decided to deactivate my plug ins and try the export anyway. I was able to export Types after that.
I will be exporting from Views and CRED at a later date so I decided to track down the conflict for reference in case it reoccurs. I reactivated each plugin and rexported Types until I received the empty ZIP file again. When activating the Email Users Plug In (http://wordpress.org/plugins/email-users/) I received the empty ZIP file. I believe it is creating a conflict with the Types export functionality.