cannot properly customize font-latex-...-face

[Giacomo Boffi]

with a recent 21.5 (beta29) "garbanzo" and the last auctex package
from auctex people

if i try to customize font-latex-...-faces--- in particular i tried to
customize font-latex-slide-title-face --- i can change ONLY the
foreground color of the face

any suggestion?

tia
                                                        g

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