I haven't been able to see the expiration dates either for at least a month. Tried it on various computers/tablets in all browsers I could think of (IE, Firefox, chrome, all latest versions.) Also tried with incognito mode as well as with all add-ons disabled.

When I click the Expiration Dates link it loads for something like a minute, then comes back with a custom error message. My expiration dates should be all pretty far off, so haven't worried about it too much.