Mike – I am not able to reproduce the issue. I followed the same steps in Project Professional 2013 – changed the text style of critical tasks, marked a critical task completed, the color changed to black (the default color). Do you mean to say for some tasks the color changes and for some tasks it works correctly? Also, try clearing the formatting that might have been set on some these tasks by first selecting all the tasks, then click Task ribbon, in the Editing group click Clear .. Clear Formatting. This action will ensure any font color changed on that tasks will be cleared and the text style font color will be applied.