Slide won't advance when I add animation

I've created a test using PPT 2010. The code will not work on the one slide where I added animation. The statement is: The little spinning wheel means something is wrong! The option is True or False

I inserted the shape and added the animation to continue until the next click, (when they click true or false).

Choosing T or F, sometimes the slide advances and other times it won't. What could be the problem? The same code works for all the other questions.

In case you need to know, we're using Windows 7, Office 2010

Sub Correct()

MsgBox ("Very good!")

ActivePresentation.SlideShowWindow.View.Next

End Sub

Sub Wrong()

MsgBox ("Wrong answer")

ActivePresentation.SlideShowWindow.View.Next

End Sub