I'm trying to have a counter in all slides of a powerpoint presentation.
The counter needs be controlled a button in all slides that increases it.

I can do it for one specific slide, but when I do it with a slide master it doesn't refresh the screen during Slideshow mode. I have to exit slideshow and enter again to see the changes.

Code that doesn't refresh in Slideshow mode:

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Code that works (but only applies to one slide, not all slides in presentation):

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Thanks!