At first I thought your lens might be dirty but you say it will read the toc of a disc with folders but they are all empty. This is BAD! However, you may have dirty CABLES/CONTACTS! Un/Replug all connectors. If you stil have probs, use "add/remove" hardware and reinstall your burner,see what that does. Lastly, add/remove your burning apps and reinstall them.
That's all I can think of.
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