Sure same here..
I signed up with them for the same reason you did.. well got an invitation and it worked fine from July. Then they did upgrades and believe it or not, I can log in, review and approve submissions and so on but when I try to reply, forward or compose an email, it crashed my browsers.
Now the submiiters may think I'm some heartless webmaster
PS
They had hacker problems so this may explain the new "improvements" they did.
See
http://story.news.yahoo.com/news?tmp...gmailmailboxes