I don't know if you downloaded the driver from here, if not you could download this 1 and check if they are both the same . I have known pre-release and release drivers to get mixed up even a bad file
this is AMD`s webpage for Pro drivers Workstation Graphics Drivers
online service request email Email Form
another page, software specific drivers AMD FirePro™ Professional Graphics Certified Applications
could also be Microsoft`s updates taking the toll
looks like you need to email them then. things always go wrong on a Friday. Roll back the driver if you need to.