It looks like there's something else going on that's interfering with your ability to run the planner.
Have you tried updating your version of Java to the latest version? You can get the latest version from this link:
http://java.com/en/download/index.jspAlso, if you wouldn't mind telling me what OS and browser version you're using, that would be great.
Finally, if you can see a Java icon in the taskbar on the lower right of the screen, you might try right-clicking it and selecting "open console". Then run the planner and see if any error information is displayed.
Thanks,
Jim