So I had this issue going on for a couple days. My gmail would show that I have inbox(1) even though I didn't, and now today it would not send any of my emails. Big problem! So I looked around online and found this fix, that is working so far. Go to settings Go to applications Go to Manage Applications Hit menu then filter and select all Go to gmail and gmail storage Clear both the data and cache from both It will give you a warning about clearing the Data, saying that it will delete the account, blah blah blah. If this is your main account no worries. I did that and then went back into Gmail. It said wait your email will show shortly. It re-synced and is working great now! Thought I would share!