Script Output Font Color setting does not get saved after Toad for Oracle 12.7 is re-started or re-launched.
To replicate, go to Toad Options | Scripts | under 'Script Output' | Font... button | change the 'Color:' to white (or any other color) | click Apply | OK.
Font Color reverts or changes back to Black the next time Toad is launched. This requires user to change the script output font color every time user re-starts Toad.
Issue fixed in version 12.7.1. The latest version of Toad for Oracle can be downloaded here.