I have posted this in Selenium forum but couldn't get any response there. Another person also expressed a similar concern in a separate post, so I'm assumed this is a bug in the implementation. Following the steps below Selenium hangs (I'm using Selenium RC 1.0-beta) – 1. From the main page (say Window A), click on a button X that opens a popup window (say, Window B) 2. I could access Window B fine, and click a button on it which opens up a new popup window (say, Window C) 3. Again, I could access Window C fine and perform certain operations. At the end click 'Submit' button which submits the form. 4. Upon successful submission Window C gets closed and the data that is posted is displayed in Window B (as this page refreshes) After this, no matter what I do I was unable to perform any operations on Window B. I believe reloading the page on Step 4 is causing it. When I try selectWindow() on Window B, selenium hangs. I have searched through this forum and others couldn't find any solutions to this. However, I found very similar scenario described here (4th post in the page): http://clearspace.seleniumhq.org/message/48061 The problem described there is very similar to what I described above: ------- Clicking on the link From the main window I turn to form opened in a new window. Fill the form fileds and click by submit ( selenium.click("add") ). After sending data from form (post) form successfully rose. Selenium server return OK. Then test hangs on the next step I irrespective of what action is as follows. Pressing the sabmit makes the following: window.close(); - close the form opened in new window window.opener.parent.location.reload(); - refresh the main window window.location = ... ; go to the main window. Implies that the reason of test hangs is window.opener.parent.location.reload(); It seems that selenium lose the current window and now does not know where to send queries. --------- Please let me know if you need more information.