What was I thinking? Using something as complicated as a hijacked (from the Console) Task view was bound to have problems when creating an Activities tab.
Let’s restate our goals:
Create a tab that will show Activities, using the Enhanced Lists view.
Don’t have two rows of tabs.
Question: Is there any way to make a view and to specify that we don’t want to see the Sidebar AND the Tabs?
Answer: YES. The answer is Visualforce!