In some cases it is possible that the Multilayer Mix Volume 2 Montage templates that are included with Creative Pack Volume 1 will not render correctly in the Timeline. The result is that the overlay drop zone is not visible.
The solution for this is to go to Setup > Video and Audio Preference. In this settings window there is a checkbox for "Enable full-resolution preview." Check this box and then click OK to close the settings window. The issue should now be resolved.