Reload the web page.
Sometimes your web browser simply doesn't load all of the resources that it should, and Java can take a while to start, so the Java applet is simply ignored. To force a clean reload, hold down the shift key and then click your browser's reload icon. Also your browser will remember if you told it to NOT allow Java to run or the site's Java applet to not run, in this case you should exit your browser and open it again ... sometimes you might have to restart your computer.
Tell the Java plug-in to run.
By default your browser will likely not allow Java to run unless you say so. Sometimes the dialogue to run Java is hidden behind a "lego block" or just sits in a semi-obvious banner across the top of the web page.
Tell the web browser to run the application.
Another security check. This one usually takes a while to surface, however, until you click "Run" the Java application will not be allowed to function. Note that sometimes your web browser will remember you clicked run, so you may not see this dialogue.
Add the study web site to Java's security exception site list.
Get the latest version of Java installed from Java.com.
There are new versions of Java published very regularly. These often include security updates, and your web browser may prevent you from running an outdated version of Java. Note that sometimes you will not have the privileges necessary to install Java on your work computer, so you might have to call your local IT department to help.
Don't use Google Chrome or Microsoft Edge.
I highly recommend using Firefox as your web browser. Internet Explorer has been successfully tested - ensure you have updated to the very latest Internet Explorer (not Microsoft Edge). Safari and Firefox have been successfully tested on Mac OS X.
Google and Microsoft have had legal issues with Java, and have decided to remove support for Java (and other plug-ins) from their browsers.