Mike,
are you using third party components?
Even if the components are registered does not mean that you can use it for compile. Components come in two ways: the development version (that you use to compile) and the distribuitable version (that you include in your distribution package). This inhibits your client to make executable using that component (that they did not buy).
It is possible that the process of upgrading overwrote one of your development components, and it not easy to say each one... Try adding your third party component one by one in your test application, painful. If you find the wrong one, you have to reinstall it.
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