Filter products by attribute not displaying in sidebar

This was a strange issue I came across recently after installing a newly developed WooCommerce theme on a test server.

Some head scratching and Googling later, I found out it’s a known problem stretching back 2 years that randomly occurs on some sites.

There are a few fixes out there but the only one that worked for me was to go into WooCommerce settings, click on Products, then the Advanced tab, and then to un-tick the Enable Table Usage option.

Automattic say they’re working on it and should have it addressed in a future version.