[boggsie]

I believe that the OP is describing the impact of the bottom bar where the start menu icon appears in the later builds of Windows Phone.

In these builds, the start icon no longer appears at the top-left, but has moved to the lower-left and the row and the entire bottom row is a few pixels taller.

Some applications appear to have been hard-coded with the assumption that the width of the bottom bar/row and now the higher bottom bar/row covers up the bottom of these applications.

As far as I know, I do not believe there is a registry edit to universally fix this behavior. You would have to look into a fix on an application by application basis.

Best regards,
-boggsie