i just got the evo today and did the firmware update. Now in portrait view the notification window will not come down. but if i go into an app or something and go into landscape it will drop down. i dont think its a screen issue because that side of the screen still works and is functionable if say i touch an email or something. So i think it has to be a software issue. Any way we can bring sprints attention to this would be great. I have tried shutting it down and taking out the battery and it hasnt worked. Also i have seen this issue on other forums and they have had no luck resetting the phone at the sprint store.
Perhaps try a factory reset? I don't have my Evo yet, but it sounds like something went weird after the update. Just try doing a factory reset in settings and it will probably fix itself.