That is very strange that (for you) the translated page does not appear in a pop window - I've just tried it again on 2 different languages and the translated pages was displayed in separate windows. I have tried this on both windows pc and mac and still I get the pop windows. I have tried Safari, Opera, FFox, Chrome and had the same results. I initially couldn't see translated languages until I realised that the browsers were set to block pop up windows.
I asked colleagues on different computers to try and still the pop up window appear. I checked the config.php and could not see anywhere to disable this function (I cannot see the code to change unless I cannot see the woods for the trees - British saying).
This is a real problem for me as most browsers block pop up windows. I appreciate your help