These are changes related to spell-checker in the version 1.5:
•Customizing of the spell checker error underline
You can configure the spell checker error underline in version 1.5 or newer, as system defaults and per-user.
Edit EditorialConfig and locate the following keywords for the system defaults settings:
SpellThickSrc="1"
SpellThickJust="2"
SpellColor="Red"
Where:
•SpellThickSrc (int) : Spell underline thickness for source editing (1=thin [default], 2=medium, 3=heavy)
•SpellThickJust (int) : Spell underline thickness for WYSIWYG editing (1=thin, 2=medium [default], 3=heavy)
•SpellColor (string) : WPF Color name or html code (example: "Red" [default], "#17A9FF" ...)
Change values to what you want.
The user can optionally override these settings into Ted Preferences / Spell Checker tab.