Redundancy gateway

I have a Gateway as redundant in version 8.0, but I have several problems.
I am using two plc's, to generate data, but when it is time to throw the master, the backup takes effect, but it stays in a loop where a pop-up screen appears and from there it does not happen and if it goes past that screen my tags do not load .
But when it comes to restarting the application it catches perfectly.
Has anyone had this problem and any advice they can give me with the problem?