Hi there @danielflame,
I’m glad to hear you were able to narrow down what was causing the issue on your site! : )
@debbarrett, as with danielflame’s situation, the issue is most likely being caused by code in either another plugin or the active theme which has not been updated to be compatible with WooCommerce 4.0 yet.
In order to narrow down what is causing the issue, please temporarily switch your theme back to Storefront and disable all plugins except for WooCommerce, then check to see if the issue is fixed. If it is, then you can switch your theme back and reactivate plugins one-by-one until you find the one that is causing the issue.
You can read about testing for conflicts in our documentation here:
https://docs.woocommerce.com/document/how-to-test-for-conflicts/
I hope that helps!