Using ZC 2.1.0 / php 8.2
I haven't given up on this working but nearly there. I am using a test site completely free of other plugins and installed DBIO from Github.
Installed Products Options - Worked, no issue
Installed Product Options Vales - Inserts all lines, however when trying to view products via Catalog > Option Value Manager - Nothing appears, just blank.
I then went to PHPMyadmin and viewed the table of Products_Options_Values and they are all there...
I also checked products_options_values_to_products_options and it was blank.

Anyone suggestions? Anyone? Thanks :)