I have installed the latest infrastructure update for both SharePoint WSS 30.0 and Project Server 2007. I was really impressed with the GREAT enhancement that has been done through.
The most feature I liked was the Timephased view. But I faced one problem where suddenly this view was not showing and i was back to the normal view before applying the infrastructure.
Needless to mention what I did to fix this out but finally I figured it out. So the reason behind not showing the Timephased view (Calendar view) was because I have modified the My Assignment view and have removed the "Progress [Assignment]" field in the related view.!
This field should be there to get the Timephased view showing correctly, for me I was trying to make this screen simple for my customer and % Work Complete was the main field. That is why I removed the rest.
As a conclusion, don't change the default selected fields for this view in order to get the My Tasks page shows the views as expected.