Hello and thank you for your feedback,
I have tested the plugin on Windows 10 with WordPress 4.3 and the most recent versions of Firefox (that’s where the screenshots are from), Chrome, IE Edge, and even an old version of Opera and an even older Safari 5.1.7. I also tested it on Firefox for Android on my mobile phone. Besides that, I have it installed in around 40 of the websites that I maintain. In all cases, it worked as expected.
From your description of the problem, my guess is that there might be some issue with the loading of jQuery and/or perhaps some conflict with some other installed plugin.
Could you please send me a list of your installed plugins, to do some local testing? A simple screenshot of your installed plugins screen would be enough.