Had the same problem, also Chrome, but works fine now! Try clearing your Chrome cache
Re:Wunderlist for Web is here
by christian_reber on Friday March 11, 2011 @09:47AM
(#2313458)
We deployed an update, is it working now?
Nope! Still the same. I'm using Google chrome.
Check the image. https://skitch.com/aslam/rw8g4/wunderlist-home
Anyhow awesome work folks!