Help Deactivating Skip and Back Buttons During 1st Quiz Attempt

I am creating a learning module.  Within the module are quiz questions.  I want to gray out the Skip and Back buttons as the users take the quiz.  After they take they take the quiz, they have the option to view their results.  I want the the Skip and Back buttons to become active at this point.  I had this functionality working with the Skip button until I published my project.  Now it isn't working anywhere.

When it was working I did this:

Create a Variable:

-       Project > Variables

o   Click ‘Add New’

o   Type: User

o   Name: QuizTaken

o   Value: 0

o   Click Close

Create an Action

-       Project > Advanced Actions

-       Action Type > Conditional Actions

-       Action Name “QuizSkipA”

-       Press the “+” sign

o   “Untitled” will turn blue. You can click on it to rename.  I renamed “QuizSkipA”

Write the IF statement

-       Perform Action if: All Conditions are True

-       Click in the first grid box under the word “perform” so it turns Red

-       Click the Variable dropdown that appears – select Variable

-       Select QuizSkipA

-       Click the Comparison Operator dropdown and select “Greater or Equal to”

-       Select the Variable dropdown and select “Literal”

-       Type in 1

-       Red box will turn Green

Write the Action

-       Under Actions, click in the first box so it turns Red

-       Click the Select Action dropdown and choose “Go to Next Slide”

-       The Red box will turn Green

-       Click Save

-       Click Close

Add the Action to the slide

-       Click on the first Quiz Slide

-       Find the Actions Group on the Quiz Properties Tab

-       On Success: Execute Advanced Actions

-       Script: QuizSkipA

AnAny ideas on how to get this working again will be greatly appreciated!!