Just one day after the Pro-R 2 release, we are releasing a 2.01 update to fix a crash when selecting a presets on mono tracks. If you installed version 2.00 already, please download and install version 2.01 to make sure you won't encounter this crash. You can verify the version number that's currently installed by clicking Help > About in the Pro-R 2 interface.
FabFilter Pro-R 2.01 is available for download here:
More about Pro-R 2: