Hi, I don’t know what problems you found from 2012 because version 4 was only released last year. Do you have the links? Perhaps they were about version 3.x?
Anyway, it’ important you have the latest version on both client and server (4.2.27). Provided you have version 4 client and server installed, it will be easier if you enable logs both sides, reproduce the problem and then submit them to us so we can check that it’s not a problem we are already aware of. E.g there is https://www.nomachine.com/TR04L04396
More info here: https://www.nomachine.com/AR07K00677 Send them to issues[at]nomachine[dot]com referencing your topic.