I have a bunch of lists I've been working on and as of this morning they've all disappeared. Severely disappointing.

Assuming that I guessed your account correctly, all your lists are still there. is this one of them? http://www.imdb.com/list/il3SEIQ1lTg/

Please go to http://www.imdb.com/lists/ and then click on the 'See all lists by you' link on the right hand side of the page. If you still don't see anything, my best guess is that you are logged in with a different account than the one you used to create the lists. You'll need to logout and login again with the correct account.

When a user creates a list, there is a yellow "Save" button on the page for the new list. When a user clicks the "Save" button, they should receive the message "Your List Has Been Published!". In addition, the user should receive an email with a link to the new list.

Other users have reported a "500 page not found error" when accessing their lists. It appears that this problem has gone away.

I've had this happen in the past myself and the problem usually goes away in a few minutes.