Hi @bobpostle
We have just pushed out new Maintenance version for compatibility with WC 3.0.4 and backwards – please update the plugin. Should be fine – if you are still having issues please check that the theme you are using has been updated for WC 3.0 as it breaks most themes and any plugin that queries to the db.
Here is the new Sort and Display version changelog
1.7.6 – 2017/04/22
* Tweak – Tested for full compatibility with WooCommerce version 3.0.4
* Tweak – Tested for full compatibility with WordPress version 4.7.4
* Tweak – Change call direct to Product properties with new function that are defined on WC v3.0
* Tweak – Called action for save data of plugin after WC data is saved on new WC 3.0 CRUD
* Tweak – Change priority for save_post action so that it is called after WooCommerce save the product data, to get the correct data on WC v3.0
* Tweak – Update query for get products are featured from term instead of product meta on new WC v3.0
* Tweak – Update query to get outofstock products from term instead of product meta on new WC v3.0
* Tweak – Get outofstock from term instead of product meta on new WC v3.0
* Tweak – Update query to get products that are exclude from catalog from term instead of product meta on new WC v3.0