Weird CS bug? Starfield tutorials.....

Most of the starfield tutorials that I've been seeing have a recipe like this:

1) Fill background with black
2) Add noise (monocromatic)
3) Adjust levels, bringing the black and grey level towards the white and adjust to taste.

Now, I can do 1 and 2, no problem. The freaky thing is, when I go to hit ok on my levels adjustments, it never ever saves it. It always goes back to where it was prior.

Any help?

--Michael

Make sure you are viewing the image at 100%. Otherwise, you may get what you are describing.

(In other words, it is applying the levels adjustment, but the preview is not accurately reflecting what you will end up with unless you are viewing at 100%.)