I didn't look at my Excelsior, but my Defiant has a similar problem. On the default model, the blue painted parts of the hull have been missing since a fix was applied (The ship name was missing on one nacelle). After the most recent patch, the red stripes it had are now missing too. My ship now has no colour to it at all.
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You can now indeed remove all color and detail by picking "NONE", which is the setting our ships are set to at the moment.
THIS:
As Longasc said, use Andromeda for the Default pattern. None now means NONE.
If you are having further problems, try selecting the base ship on the left in order to "reset" the component first.