hi mate
There is actually a problem with the opening a link in a new window. I have raised this issue with IPB but noone took notice.
When you set it to open in a new window the current window also goes to the page you are trying to reach, so you end up with both windows at the other website (if that makes sense)
There is a whole new update on its way soon, maybe a month or two (awaiting bug fixes) and there will be big changes. Hopefully fixes the issue