Thanks, Ethan! That is really valuable information from someone who is THERE. The Borghese may have gotten a reversal of the rules set for ALL national museums back in 2014, and it must have occurred very recently. But I'm not seeing the same no-photo reports for other national museums, and I wonder if it has something to do with a special exhibition, "The origin of the still life in Italy - Caravaggio and the Master of Hartford" there until Feb. 19th?
The website says that demand for tickets has been very high for this showing, and photos are often restricted for exhibits of works on temporary loan to museums.