Arial bug? Hidden option?

Hello,

Since the last update, Scrivener has a strange behavior : in the standard editing mode, Scrivener doesn’t detect Arial normal. To be precise :
file → option → editing → formating : arial normal is available
BUT if I try to apply arial in a document to replace “times new roman”, it will be displayed bold. Arial normal seems to be gone.
“Show fonts” option shows arial : bold, bold italic, italic, and arial black, normal but arial black is in fact the same than arial bold.
I can’t find any option that could explain this strange behavior. Any hint, idea about where it could comes from?

EDIT :
Well, in fact file → option → editing → formating bugs too