Storyline 2 'Next' button

I've started using SL2 and am having a strange problem. In Preview or when published, the Next button often does not respond until it has been clicked several times. On one occasion seven mouse clicks were required to persuade SL2 to go to the next slide, which is very silly.

All the other buttons (in quizzes and ones I created within the course) are behaving normally. It's just the Next button that seems sticky. I don't have the problem in SL1 or in any other program, so it's unlikely to be a fault with my rodent.

Anyone got any ideas?

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