I can't see Dababase Tree in Teradata Administrator

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I can't see Dababase Tree in Teradata Administrator

Hello!

I can't see Database Tree in Teradata Administrator. So, the objects (BDs, tables, users) are enabled but I can't see. The objects are invisible.
I try clik in anywhere from Database Tree area, and the Teradata Administrator responds and shows me the detail inside the right panel of the screen,  however, I can´t know the source of the detail because the Database Tree is empty.
I also tried on another PC and I can see the Database Tree perfectly, for that very reason I think it can be a problem of Windows 8 (my SO). When I refresh (F5) then the follow error appears: Error 35602: Key is not Unique in Collection.
I installed Teradata Administrator again and the problem continues.

Can somebody help me, please.