Make sure Javascript and Java are enabled in your web brower (by default, they are).
Reload the current Web page (shortcut key : F5).
Clear your web browser cache.
Clear the Java cache.
Since Java update of January 2014 (Java 7 update 51), it is necessary to add this adress http://www.tictone.com to the exception site list of the Java control panel.
Make sure your web browser allows the execution of Java.
By default, web browsers (Firefox, Chrome,...) display a message requiring your authorisation when a Java application has to be executed.