I've noticed two issues with the beta. The first is that if I tick "Do not show deleted messages", it shows no messages at all.
The second appears to be an issue with an older version of firefox (5.0) but I have not tested it with newer versions. If I leave the mail view page, say settings, and then return, the inbox does not load ("Loading" with the spinning wheel until the request times out). (Chromium 13 and IE8 work fine.)
