browser window remains opened after several web urls are loaded

Hi. I am finding a possible bug that somehow was already commented some time ago in a forum thread http://www.interactbuilder.com/forum/interactbuilder-3-0/browser-window-problem/; though the solution suggested there seems not to work: I create a Browser element where I want the web pages to show. I have two objets on screen with Browse behaviours added; both of them targetted to the same Browser Object. When I go into Interact mode, I load the first web page; I then load the second without closing the browser window (I let the show closing button option turned on), and It is succesfully loaded. But when I try to close the browser window, only the closing button dissapears, while the browser window itself remains open. It stays open also when I go into Design mode. I have to quit the app to have the b.window removed. Nevertheless, if I load a web page on the browser in InteractMode; and before tapping the second element with the browse behaviour I close the browser window; the latter reopens and closes normally. Do you know if this bug happens also in the published version? I am considering to create one different browser window per each browse behaviour to avoid that..