Hi Ivan,
That looks like the plugin javascript is not loaded properly. The most likely cause is, that a 3rd party plugin/theme or custom code is causing a major javascript error before the page can load, and it stops the plugin from loading.
Make sure to clear your browser first, to see if that changes anything. Then disable all plugins and switch the theme temporarily to see if the issue persists.
If so, then try reinstalling the plugin to make sure there is no missing files or other file related problems.
Then, if still no luck, please add temporary FTP and back-end details, and I will check the error console.