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Slow export on slideshow

Jan 19, 2018
San Jose
Lightroom Experience
Lightroom Version
Cloud Service
Operating System:
Exact Lightroom Version (Help menu > System Info):
Lightroom version: CC 2015.12 [ 1125239 ]
License: Creative Cloud
Operating system: Mac OS 10
Version: 10.11 [6]

OSX El Captan

4 Ghz Intel Core I7

32 GB Memory
I discovered yesterday that slideshow is not exporting. I’m using 10 images and no music.

All files are DNG files (and as a test all horizontal (I noted back in August that it had been suggested that a portrait image might have been causing the difficulty)

I did reset preferences as another post suggested.

Also, I have gotten this error but not consistently “The destination file is in use” when trying to export the slideshow to my desktop

The slideshow hangs.

Any thoughts?