Hello.
After last woocommerce update, to 3.4.4, all product images, single product image and product thumbnail was automatically regenerated to approximately 100x100px instead of 1200x800px and 600×400 and now looks simply awful. I was trying to regenerate it several times with all plugins on, all plugins off, different php versions, with imagick and GD library, increasing/decreasing memory limits and many other changes, also was trying to regenerate it with “Regenerate Thumbnails” and “Force Regenerate Thumbnails” plugins, few times I’ve change products thumbnails sizes (1200x800px to 1100×700 for example) and then regenerate it again, just to try. All this manipulation was tested with Avada and good old Twenty Seventeen themes. All newly imported products are also 100x100px.
Fortunately I’ve found Symbiostock 4.0.0 version and revert to it. Now everything looks perfect as before and I’m planning to stay with it until I will find solution to fix this problem.
Regards.