Good to know it's not that. You use wireless to connect, right? Does the same happen when connected via cable?
Just clearing some possibilities here.
Thank you very much Kry, I really appreciate your help.
No, I don't use wireless, both computers are via cable. I can use it, but for my business is safer use cable. Actually I have disable wireless in both computers, my iMac AirPort is disable.
Thanks again.
PS: I leave the screens for a week, beginning tomorrow, please excuse me if don't answer until august the 21.