I am also getting the same wp_get_current_user error. I tried halinagold’s solution and can get to the “Your database is out-of-date. Please upgrade.” message. However, when I click “upgrade”, it just reloads the same page and nothing seems to happen.
I am having the exact same problem with a BlackBerry 8700 on my blog.
http://nexthought.net/blog
Thanks,
Nate