When I tried to highlight a word in the Editor, it highlights a different word instead.
Open Toad editor and enter the following comment
-- This is a test /* This is a test */
Double click on word test, is is selected.
Toad Editor does not highlight the select word if the Editor font is Courier.
WORKAROUND 1: Go to View | Toad Options | Editor | Display. Under Fonts click on the Editor button and change font from "Courier" to anything else.
WORKAROUND: If you must use "Courier" font you can uncheck "Italic" under View | Toad Options | Editor | Behavior | Languages | ellipses box | Highlighting | Comments. This will prevent the issue also.