If you've come across an issue where Overwolf itself and apps installed in it look botched and grainy (check out some examples below), this is most likely due to a setting called "Hardware Acceleration".
This can be fixed very easily by disabling the Hardware Acceleration option in Overwolf.
All you need to do is:
- Open Overwolf's Settings window
- Go to 'General'
- Toggle the 'Hardware Acceleration' option off
- Restart Overwolf in order for the change to take effect