We can reproduce this strange behavior with Chrome, but it seems that the problem is not in our plugin.
It is very interesting, because if you open Chrome console (ctrl + shift + j), and then reload the page while the console is opened, it is works perfectly!
However if you does not open Chrome console, at the time of page loading, but later open it, then the problem occurs again, and on the console
Failed to load resource: net::ERR_CACHE_MISS error messages appears.
We have seen this error in forums, and most of the forums said it is a Chrome issue, and unfortunately we have not found any solution what we can do to resolve this problem behavior.
Trying it with FireFox, it works perfectly.
Unfortunately at this moment we cold not solve this problem, because the problem is not in our plugin.
If you can not use the plugin because of this problem, please write a mail to firstname.lastname@example.org to consult what would be the best option for you.