Truclietn page scroll causes lost object

I have an page that during playback in the Deveolp Script section, and also replay, that will scroll unexpectedly.  This causes the object at the top of the page to not be visible, and so when run I get an object not found error.  Please advise.  Ther edoes not seem to be an option to lock the page.  I am using the FF with TruClient -web protocol.