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Custom Object tab in Customer Portal
We are using Customer Portal with High Volume Customer Portal Licenses and Person Accounts (Winter11) - we have enabled a custom object tab in the Customer Portal tab settings, the object is deployed and available for Customer Portal, the fields on the object are accessible by the High Volume Customer Portal User Profile and the Person Account has a valid license and can log in to the Customer Portal. The Custom Object has public read/write access and no relationshiops or dependencies to other objects. The Custom Object Tab does not show to the logged in user or to an admin using Login as Portal User - is there anything else needed to enable a custom object's Tab visibility in the Customer Portal?
See the "High Volume Customer" Profile.
Under section "Tab Settings", find that your custom object has "Default On" value, and not "Tab Hidden".
Also, under section "Custom Object Permission", check the Read access.