There is a conflict with Smart Variations Images & Swatches for WooCommerce and when both plugins are enabled, the swatch colour disappears from the archive pages and product pages. If Smart Variations Images & Swatches for WooCommerce is enabled and Variation Swatches is switched off, the pictures work, but the swatches don’t.
Thanks for reaching out to us. Unfortunately, you can’t use two swatches scripts on the same site.
Either you can use Smart Variations Images & Swatches or Variation Swatches Plugin.
With our previous version, you can use Smart Variations Images & Swatches. We have updated our code to optimize our plugin. So, now it is conflicting with other swatches plugins. Because all swatches plugin uses the same hooks.
BTW, I have already sent this information to our development team. I hope they will look into it.
Note: For additional variation images you can use the Additional Variation Images Gallery. Which is also our plugin and compatible with Variation Swatches.