Issues listing new products

I’ve been selling on Amazon for 20 years. Pro seller account is in good standing, no violations. No notices about deactivation, etc….

I was able to list products on existing listings a couple of days ago without an issue. But yesterday, whenever I pull an item listing up via UPC or name and hit “sell now”, the screen momentarily switches to the standard listing page and then goes blank. This has happened with multiple products across multiple categories.

I have no notifications that these products are blocked because that would always say “apply to sell”. I don’t have any notifications that I need to update any information on my account. Is anyone else having this issue? Thanks!