Using Chrome I found the slide show would not work myself until I found the setting needed to make it work.
But Chrome has been updated since then
Just follow the screen shots till the end 6 in total. Close the chrome and reopen the page.
BUT if you are a Windows 10 user this may sort the problem I have not tried this
Mac computer user try this https://helpx.adobe.com/flash-player/kb/enabling-flash-player-safari.html
Tablet User I know the flash players will not work I have same problem.
However I have found out that they will work if use a app from Google store called
Photon Flash Player Browser 3.7
You need to click the Flash Lighting stick top right corner. This app contains ADDS
There show be the slide
show running on this Blue screen
Click the three dots to open the drop down
and then the SETTINGS
With in the next page SETTINGS go to the bottom
The click SHOW ADVANCE SETTINGS