Workflow Definer window is blank - no errors

I am trying to access the Workflow Definer to view the graphic layout of the workflow. The initial template window appears warning not that it should not be closed. A warning then appears asking if I want to run the application. When I click "run" the workflow window opens but it is blank. It does have a java icon beside it but there is no error.

I am using Windchill 10.1 on IE 8. I was told to install Java 32 bit (1.6.0_21) and this would resolve the issue. Unfortunately, this is not the case.

Anyone have any suggestions as to what might be causing this? By the way, another user is able to view the workflow. We cannot see any difference in our setup.

Thanks

KR