You have successfully entered Protected Workspace - But it hasn't...

How does the BIG-IP software know if the Protected Workspace has been already entered?

 

I'm getting a problem every so often that when attempting to launch the Protected Workspace it does not allow me to stating "You have successfully entered Protected Workspace". You can close this browser window.". but doesn't actually launch the protected Workspace.

 

I've tried uninstalling BIG-IP, rebooting, trying to clear old BIG-IP files hanging around with no luck.

 

In the past when this has been fixed by rebuilding my laptop.

 

Please can anybody help?