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I have another email account within gmail and all has been fine but I notice that when I do a search now and I am searching for a email from that account it does not show in the search results whereas I am sure it did until maybe last week!
It does have a label where they are all stored, if I delete that label do they then come into the inbox (I'm sure that it used to!!)
Is Gmail still picking up the mail for that account?
Check in Mail Settings>Accounts and Imports>Collecting mail with POP3 to see when the mail was last picked up. I've noticed it is slower than usual, and have to do a manual refresh (button at top of inbox page).