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Is there something additionally that needs to be done to address the images? If I shut off image display in IE, the padlock displays correctly. All our images references appear to be relative and within subfolders of the folder we're redirecting to.
The basic problem appears to be that you've 'mixed up' URLs with filepaths; They don't necessarily have to be related. In so doing you've thrown a client redirect into the mix, which is unnecessary, slows down your users' transactions, puts double-entries in your server logs (screws up your stats), and may be the cause of this SSL problem. Like many technical misunderstandings or errors, little errors in server configuration can cause *big* problems.