N/APosted on - 03/08/2012
Many experienced that problem. Mainly because the web browser is out dated or the JAVA installed in you computer is outdated too. I suggest that you update your JAVA by going to their website http://www.java.com then download the newest version. It will be updated to the latest stable version.
Second update your web browser to the latest version. Sometimes incompatibility between the versions of the web browser and the JAVA significantly can be seen by the errors and freezing of the program. Try this tip and find out what is wrong. Good luck on your JAVA training!