Toggle preview button is grayed
On a new machine (800xA 5.1 RevB), when i try to open the engineering workplace, the toggle preview button appears gray and we cannot see all the aspects of all the object.
On all others machine in the new system, the engineering workplace is working normally.
Have you got a solution to solve my isolated problem? Configuration of IE8?
I already try to logon in another account and it's the same.
See the capture: