iPad no message selected when saved mail

My iPad have multiple messages in inbox since I upgrades to iOs 4.2. When I get new emails, I read it, and then I move it to a folder. Before I upgraded, mail used to automatically go on to the next message in the inbox. But now I get a grey screen with the text "no message selected". How can I fix it?This is a bug for iOs 4.2. This issue is annoying and frustrating. The mail app also crashes