Hi!,
I’m having the same problem, I tried what you´ve suggested,
I deactivated all other plugins and installed only YITH WooCommerce, It worked, but after installing it appears a message “YITH WooCommerce Wishlist is enabled but not effective. It requires WooCommerce in order to work.” and the same problem appeared once I installed WooCommerce… It looks like the problem is those two plugins working together…
Can you please help us with this? I need to start working with the custom theme that requires your plugin to function.
Thank you!