Shape Visibility Errors in PowerPoint 2007

[CrazyPP2007]

Hello,
I am new to the forum. I have created multiple PowerPoint slideshows with PowerPoint 2003. I use these presentations for quizzes. In each of these presentations I have multiple toggle button pairs which I use on the first slide to adjust the settings (Each button of the pair is in the same location, with one visible at a time). My buttons are placed in the Master Slides for protection. I could click between these buttons for as long as I wanted with the 2003 version. In the 2007 version the buttons have started inconsistently freezing when clicked during a slide show. Sometimes they work, but most of the time after a click or two either both buttons will become invisible or it gets stuck on one button. Other button pairs will continue to work. For example I link the following macros linked to a button pair:

Sub ShowAccuracy()
ActivePresentation.TitleMaster.Shapes("ShowAccuracy").Visible = False
ActivePresentation.TitleMaster.Shapes("HideAccuracy").Visible = True
ActivePresentation.SlideMaster.Shapes("Score").Visible = True
End Sub
Sub HideAccuracy()
ActivePresentation.TitleMaster.Shapes("HideAccuracy").Visible = False
ActivePresentation.TitleMaster.Shapes("ShowAccuracy").Visible = True
ActivePresentation.SlideMaster.Shapes("Score").Visible = False
End Sub

I have checked to make sure that the button names and macro links are the same with 2007. I have tried it in both pps and ppsm as well as using msoTrue/msoFalse. Anyone know why this is happening, and more importantly how I could fix this?
:help
Thanks!

[CrazyPP2007]

I have improved the function of the buttons by moving them out of the Title Master and ensuring that all of the “Visible = True” are first. The buttons now allow one click only (to the next button), but gets stuck there. What a pain!
I also have noticed that the student name inputted right before going to the second slide (by a click of a button) doesn’t appear until the third slide. The last student name appears on the second slide. I have trying refreshing the second slide before going to it with “SlideShowWindows(1).View.GotoSlide” with no luck. Is there a better way to refresh a slide or a shape on a slide?

CrazyPP2007