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The first thing to do is to run your code through an HTML Validator [validator.w3.org] and see if it can spot any unclosed tags that may be causing this problem.
High levels of nesting should ideally be avoided. Some browsers will not render anything on the page until they have worked their way through the entire table structure. This means that a page that uses a lot of table nesting will render that bit slower. It also makes debugging a nightmare!
Have a look at using <div>'s instead - they can make life much easier once you get over the learning curve!
HTH
