The ads are out of my control, but Boards2Go does listen
when users complain. They're not in total control either - the
ads come from their ad service providers who, BTW, also
listen when B2Go complains about individual ads.
I'll post your comment on their forum, and we'll see what happens.
In the meantime, be sure you have 'disable popups' set in your browser.
The 'Alt-F4' combination will kill the active window
without invoking any hidden window code. Some 'bad chaps' program
the "X" click to do something other than close the window.
Keep me posted if it doesn't improve.