Some Editor display settings styles (default and custom) are not all being applied to the code. Not all settings and types are affected.
Edit Options | PL/SQL Language Management settings for Number is not being applied.
1. Right-click in PL/SQL editor | Edit Options | Options, Language, PL/SQL, edit | Highlight tab and choose the Number type.
2. Makes changes to the font color, background, font style. None of these are applied to the sample.
3. Click OK to the option window and test the changes in the Editor window. Again, the settings have not been applied.
This issue is fixed in Toad for Oracle 9.1. This version of Toad for Oracle can be downloaded here.