Slide Master Layouts - Tells me they are being used but no slides using them?

Jan 13, 2016

In my storyline file there are slide layouts and masters that I want to get rid of but storyline is telling me they are being use by slides. They are not being used by any visible slides.

 

I have even gone in there and assigned all slides to 1 layout to try and free them up but no good.

 

Does the file need a clean up? Are there hidden slides I cannot see?

 

Can anyone help with this?

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