Faded Text using addtext command

[Vishav]

When I am using addtext command of vizard to display instructions on screen some of characters are faded. I couldnot able to find reason.

This is my command code:

instructions1 = viz.addText(' Task One \n' 'Press Spacebar to Start Task 1',parent=viz.SCREEN)

I am attaching snapshot of screen

Please do Help.

Thanks