FTP to your site and find the following file:
wp-content/nextgen-gallery/shutter/shutter-reloaded.js

Search for and comment out the following two lines:

document.documentElement.style.overflowX = '';

window.scrollTo(0,t.Top);

Unfortunately, if you auto-update the NextGen Gallery plug-in and this isn’t part of their update, you will need to re-do this.

Much thanks to the WordPress community for finding and sharing a solution.

Access your site files via FTP and edit the wp-config.php file. I generally place it just above where you define the database is, which makes it the first two uncommented lines in your wp-config.php file.

Add these two lines to your wp-config.php, where “example.com” is the NEW location of your site.

define('WP_HOME','http://example.com');
define('WP_SITEURL','http://example.com');

This is not the best fix: it’s just hardcoding the values. You won’t be able to edit them on the General settings page anymore when using this method, but when you’re desperate, this is a good hack to gain access!

Thanks so much to filosofo and WordPress.org for sharing this hack!