Navigate Visited Slides Only option greyed out
Hi
I'm at a total loss as to why the 'Navigate Visited Slides Only' option in my Captivate 2019 course is greyed out leaving me unable to interact with it. Basically if I click 'Enable Navigation' (which I want to use), the 'Navigate Visited Slides Only' option ticks and remains grey.

I've read online that this may be due to a preferences corruption but the issue has never been resolved and no one has ever offered a work around.
Is there anything I can do to resolve this mystery as its creating a massive problem.
Thanks in advance for any help or guidance offered.
