Provia is one of Fuji's true delights, and will handle exposure errors gracefully, unlike its Velvia brethren. It's not too contrasty (shadows and highlights are well balanced), nowhere near as overtly saturated as Velvia and handles very long exposures with ease (excellent for star trails). So I'm pointing the finger at the guy behind the camera and also
at that camera!
I would be checking the following
critically:
• Exposure compensation
• Av / Tv values: are they accurate? Alternate lenses to check this
• Meter accuracy or meter type: what have you got engaged, spot, eval/matrix, partial, CWA? A meter inadvertantly set to spot and aimed casually (i.e. without proper consideration of tonal values in the scene) is a common blunder.
• Battery(ies)
• Bracket 100, 125, 160 (0.6 stop will be very noticeable on Provia 100/100F)
It is unlikely Provia will be washed out with normal metering unless something in that area is throwing the meter off. Even more unlikely with evaluative/matrix.