Help! Can anyone help me please? I am in the middle of a tutorial and got to the step where I have to apply the quick mask. Trouble is, when I click on it, the image is not overlaid with a transparent red as it used to do. I have checked the menu, where you can change the overlay colour of the mask and it is, in fact set to 50% red. I have even tried setting it to 100% and nd also rebooted to no avail.
I have looked in all the tutorials, but cannot find any troubleshooters on this problem. Please, please, I hope someone can enlighten me cos I don't know if its something I have done or whether the program is playing up!

I have looked in all the tutorials, but cannot find any troubleshooters on this problem. Please, please, I hope someone can enlighten me cos I don't know if its something I have done or whether the program is playing up!