We have encountered a bug in the Galleria theme (versions 1.0.3 and 1.0.4).  If you are using the traditional rotating slideshow in Galleria and notice that your slides are not rotating automatically, here is how to fix it.

• From your Shopify dashboard, click Online Store > Themes and look for Galleria.
• Click the Actions button and choose Edit Code from the drop-down menu
• Navigate to the Assets folder and locate the file called theme.js.liquid
• Click on it to open the file in the editor
• Hit Control + F (CMD + F on a Mac) and search for: autoplay: slidesSpeed,
• Replace that with:

autoplay: {
 delay: slidesSpeed,
 disableOnInteraction: false,
},

• Save the file

That should fix the issue.  Note that this does not affect the column slideshow.