Setting date span on reporting page

It used to be that when you go to the reporting page, a list of all the reports in your account would come up by default. You could use the fields at the top of the page to specify the time period you want to display. In the last few weeks I have noticed that whatever you put in there seems to stay when you log out and come back in, pretty much forever, I guess. I can't find a way to clear those fields so it returns to the default. Does anyone know how to do this? For different reasons, I need to look at different time spans, and it seems like this is much harder to do any more. I can't even tell for sure if the date settings still apply to the overview figures and the trends section.