Have been having problems with Gmail since IMAP implemented
Yes, am having problems with Gmail, but on my Mac not the iPhone. On my Mac, when I first start the mail program, it checks Gmail's server. However, when I attempt to manually check for mail, or when the Apple Mail client does, it doesn't appear to see the Gmail server.
I find I must restart the mali client to get it to check for mail. It appears that the server isn't seen again by Apple Mail when it rechecks for messages. My other email servers, AOL and my ISP account seem to be recognized by Apple Mail just dandily.