Hi Jessica,
We should start solving this problem by having a look at the log files WordPress creates when something goes wrong. If you don’t know how to enable this feature, do this:
1. Go to your WordPress directory (the directory where you find the folders wp-content and wp-includes).
2. Open the file wp-config.php.
3. Scroll down to the line where it says define('WP_DEBUG', false);
and remove it.
4. Add the following code to the next line:
define("WP_DEBUG", true);
define("WP_DEBUG_LOG", true);
define("WP_DEBUG_DISPLAY", true);
define("SCRIPT_DEBUG", true);
@ini_set("display_errors", 1);
Now, try reproducing the error. After that, check the following directories for the files “error.log” or “debug.log”.
1. WordPress root directory
2. wp-content
3. wp-content/plugins
4. wp-content/themes
If you find any, please post them here.