So this is hard to explain, but I have a trouble getting back to Touchdowns's home screen after looking at an email.
Here are two instances when I have this problem. The first is when I get an email notification in the notification bar. When I click on this new email in the notification bar, I am brought directly to the email. Now I may want to go the calendar or tasks, but there is no option to do so. All that I can do is go back to the droid home screen and then select the Touchdown icon. However, this sometimes leads to the second problem.
Sometimes, when I click on the Touchdown icon, it just brings me right back to the email I was just reading before I closed it. If I click the back button, it just takes me back to the droid home screen, and if I click the options button there is nothing to back me back to Touchdown's home.
So basically, I may have to exit the app twice before I can get back in at the home screen.