hi guys ,
Have you tried using Rev slider just to find out that it works when the browser window is focus.
However , when you click on a new tab and go back to the page it stops working.
Not to worry about that anymore after surfing the net I was able to see some quick answers.
Here is what you do.
Go to the General Settings > Misc > Disable blur / focus behaviour set to ‘on’
and you will be fine.
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