This could be because you logged into a wholesale store when your account is not authorized for wholesale. If you return to the US or default store, you will be able to see products in inventory.
If you ARE a wholesale customer and still see everything out of stock, then the site is detecting cookies from your browser of another user with a login that has recently logged in and is not approved for wholesale. Having both these user identities causes the site to not recognize your account as wholesale.
Clearing your cookies and cache will fix this, then be sure to login with your wholesale account. Switching to another web browser you haven't used in a while could also solve this issue.
If you see this error often and would like additional accounts approved for wholesale, just let us know. That way it would not matter which cookies the site gets the identity permissions from.