can't work with gate

Hello:

I have not been able to work with all the channels strips. For example, GATE does not function. I mean, it is not possible to work with it.

I can use compressors, eq, and others, but not gate. What can be happening with this?

I have to mention that at first execution of Cubase 7, the system permitted me to load gate, but not now. Obviously I am talking about audio tracks where gate should be used

If someone has something to say about it, I will be waiting because I love channel strip and I am wondering to use all of them with out restrictions.

Regards,

Carlos Schorr