In MushClient 3.12, if you `wrap output at column number XXX`, and have local echo turned on with a changed colour(yellow on black in this case), the colour won't be applied to the wrapped aprt of the echo'd input.
Say you wrap at 137, and send a line that's 150 chars long, about 13 chars will be wrapped, and those 13 chars will have the default colour of text for that world.
Say you wrap at 137, and send a line that's 150 chars long, about 13 chars will be wrapped, and those 13 chars will have the default colour of text for that world.