On my Mac/Safari with the new site the problem I get is when I call up an upcoming reservation that has free days applied to it. The res is there in the listing but when I click on it to see it I get an error message: "Number of coupons applied not available for these rental parameters". Never got this on the old site. If I use the iPhone app I can see the same res just fine.
BTW, I can see a plain "all cash" res just fine on the Mac/Safari. Yes, Flash is up to date.