I’m also currently experiencing issues with my gallery images. I have just updated to Woocommerce 3.0.4. (with backing up, but stupidly without testing) and am using the latest Mystile theme.
Currently, images fail to show on individual product pages, even though by the text that is being pushed all the way down, it seems like they are full-sized.
Is there a problem on my end or is this a bug that will be fixed in time? I would hate to adjust another theme completely to my liking!
Here’s a page as an example:
https://www.1000crows.com/product/las-vegas-glass-beer-stein/
Many thanks,
Yvette