How to create new galleries in WordPress 3.5

I’ve been getting some questions on how to create new galleries in WordPress 3.5, so I thought I’d post this brief tutorial on the matter. Here are a few facts on the subject to begin: Unless you’re using a plug-in or your Theme changes gallery control or creation, the instructions below should work no regardless …
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Properly displaying galleries with M Theater

In order to display galleries at their best with M Theater, be sure to make your thumbnails link directly to full-size images rather than Attachment Pages. Linking to Attachment Pages can cause the Attachment Page to open in the Lightbox overlay. If necessary, change the linking option in the Media Window (see below).