I just now loaded up eXtremeUI with AU about 10 minutes ago and as I was logging into the game I got this fatal error:
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Everquest II has detected an unrecoverable error and must shut down.
<verify>D:\live\eq2\framework\core\devices\src\DirectX9RenderDevice.cpp(4600)
i rectX Error. (D3DERR_INVALIDCALL)
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I noticed you had also just added the new tracking window and may have been downloading the UI and AU files at the same time you were making the updates. Could this have caused it?