GMail app question

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http://androidforums.com – I have the GMail app on my Samsung Galaxy S2. When I open it, I see a number in my Inbox, which would indicate to me that there are X number of emails in my Inbox. However, the app says "No new conversations" and I can find no way to get into my Inbox. I can get into my Spam folder, however. If I look at my Gmail account, using my desktop, there ARE messages in my Inbox so I know they must be there when I open my app. Anyone know what I'm doing wrong?? Thanks. (General)