Here is the list of themes that are already WooCommerce 2.3. ready. If theme is not in the list don't update to WooCommerce 2.3!
Theme ready for WooCommerce 2.3. :
- The Stormer
- Eco Recycling
If you updated Woocommerce to version 2.3 you have to update the Theme to the latest version. This is an absolute must and Theme and Woocommerce will not function properly if you do not update the Theme!