I tried at two different computers with Chrome and Firefox.
I checked my Java Status at
www.enable-javascript.com/
I checked my Java Version (Version 8 Update 121 )
I checked Adblocker and Noscript (not installed)
I will ask some friend to try it..
Edit:
I set the JCE editor settings to allow Javascript and allow CSS and allow PHP options - still no change
I tried TinyMCE editor - same problem.