can't advance slides

I purchased a new computer and downloaded Libre Office 7. I opened a ppt presentation and the slides won’t advance. The presentation worked fine on the older computer running LibreOffice 5. What must I do to advance through the presentation?

What are you doing? Click with the mouse, Right Arrow, PgDn?

Tested with LibreOffice 6.4.7.2/7.1.0.3 (x86); OS: Windows 6.1.


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