I was having the same problems. After a month of emails to IG it was finally sorted. This was the final email. I am using Windows 7, not sure if that makes a difference but it is a java problem.
In regards to the Advanced Charts issue you have been experiencing, this appears to be attributed to an incompatibility with the latest version of Java that you have just reinstalled.
Please follow the steps below to install an older version of java.
1. Close all browser windows.
2. Click on the Start menu.
3. Select "Control Panel".
4. Select " Programs and Features". Please note: Depending on the view you have selected, you may need to click "Uninstall a program" instead.
5. Locate all versions of "Java (TM)..." and uninstall them.
6. Once all have been removed, navigate to
Download Java 6 Update 33 - OldApps.com
7. Once it has finished downloading, run the installer and follow the prompts.
8. Close and reopen all browser windows
9. Log into the platform and attempt to open the Advanced Charts.