It was a known bug in earlier versions but supposedly fixed- Lightroom: Slideshow not working, only getting black screen | Photoshop Family Customer Community
Not being rude- but are you positive you have CC2015.10.1 ?
Edit: And update your graphic card drivers. (Also have GPU Acceleration turned off in the Performance tab of preferences)
Thanks, I didn't take it as rude, you need correct information. Below is a partial documentation from system information in Lightroom.
The last time I created a slideshow mp4 was May 2016 and I would have been using my old copy non cloud version.
I do see that near the end the Graphic Processor: failed. But this shouldn't have anything to do with reviewing and exporting. I did export the slide show to see if it created an mp4 that was viewable, it did not.
Thanks for your help.
Lightroom version: CC 2015.10.1 [ 1117303 ]
License: Creative Cloud
Operating system: Windows 7
Application architecture: x64
System architecture: x64
Logical processor count: 8
Processor speed: 2.8 GHz
Built-in memory: 24567.1 MB
Real memory available to Lightroom: 24567.1 MB
Real memory used by Lightroom: 675.0 MB (2.7%)
Virtual memory used by Lightroom: 785.7 MB
GDI objects count: 387
USER objects count: 1046
Process handles count: 1055
Memory cache size: 147.3MB / 5885.7MB (2.5%)
Maximum thread count used by Camera Raw: 8
Camera Raw SIMD optimization: SSE2
Camera Raw virtual memory: 40MB / 12283MB (0%)
System DPI setting: 96 DPI
Desktop composition enabled: No
Displays: 1) 1920x1200, 2) 1024x768, 3) 1920x1200
Input types: Multitouch: No, Integrated touch: No, Integrated pen: Yes, External touch: No, External pen: Yes, Keyboard: No
Graphics Processor Info:
Check OpenGL support: Failed
Vendor: ATI Technologies Inc.
Version: 3.3.11554 Core Profile Context
Renderer: ATI Radeon HD 4600 Series
Graphic Processor: failed. But this shouldn't have anything to do with reviewing
Perhaps it does!
It might help to search for other advice about the Graphic car drivers. I do not have the expertise to advise further.
Others with Graphics problems- Updated AMD Graphics Card and now Lightroom stops working
"incorrectly-rendered windows or objects..." found in this link- Troubleshoot Photoshop graphics processor (GPU) and graphics driver issues
Also post your question in the forum at- Photoshop Family Customer Community You are more likely to get an Adobe staff member with information that reads the post.