I cannot get certain hyperlinks to work while others do?

[Ab]

Hello everyone,

I am trying to set up some hyperlinks within my powerpoint (One slide to the
other) and some of those work while others don't. I'm starting to think that
there's a corrupt slide or a couple. I hope someone can suggest a solution

Regards

Ab

 

[Echo S]

Do the ones that don't work have commas in the slide titles?