Found the error with map 3 not loading. A simple redoing of the missions file straightened everything out. There is still some graphical errors (mainly in the finale) with props disappearing and displacements going invisible the visible and vents that do not break when hit and such which will be fixed in the next update.
This campaign has been updated, fixed, broken, fixed again. Let's see what happens. Now has the light house survival from L4D1 but as the finale. Removed the finale factors but left the buttons intact. Finale works now (at least on my end).