As noted in another post, I was pleased that a problem with the screen display was fixed by the latest release of Prevx. Unfortunately, now Discover Card does not work. I use the secure card number service from Discover. This is an application that runs to log on to Discover and creates a "single" use card number to use for internet purchases. It has automatic form fill as well a drag and drop. There is an and-on for Firefox. It worked fine the day before the Saturday update of Prevx. Now it fails to open form fill or do anything. Can't generate a card number without going through form-fill (or drag and drop if there is no matching interface on the payment screen). Disabling Prevx - works. Re-enabling Prevx - broken.