Hi Abwaita,
Thanks for the reminder on how to solve the issues.
Yes, I did try to deactivate all plugins except the WooCommerce plugin.
The page did show up again. (so this is actually a plugin issue)
This method works and it actually took me about 30 minutes to solve it.
1) Deactivate all plugins except WooCommerce
2) Activate 1 plugin at a time and refresh the product-category page.
3) And then see which plugin causes the problem.
I can share the plugin that causes the problem (it’s actually “Rearrange Woocommerce Products” but I’m not sure whether the conflict is my theme, (pagelines) or with WooCommerce core)
Personally, the one lesson learned here that I would be putting up in my blog post at MichaelTai.Co is that all this I can do by myself, and also I would definitely deactivate the auto-update plugins.
Yes, previously I had enabled automatic plugins update, but after today, I don’t think it’s such a good idea after all.
Anyway, many thanks to Abwaita and all the WordPress team.