What version 21.4? I just did my upgrade early this morning and the version is 21.3! I ran LiveUpdate two times to be sure the product is fully updated. The upgrade done was using the latest installer downloaded two days ago.
About the white window appearance: Not really too desirable, but not a problem. I can still read the documentation on the interface; and it's the product performance and application that I want - the appearance is not so important.