3ds Max :: Imported Model From Sketchup - Zoom Feature In Viewport

I imported a model into 3dsMax from Sketchup. 

The model is a 5200 sf interior building space that I had applied materials & components to in Sketchup.
 
Now that I am working on the model in 3ds Max, I am having some issues with the application of materials to the objects. Basically, some of the objects kept some of the materials that I had applied in Sketchup; however, some of the materials did not come through into Max. When I try to remedy this and apply the correct materials to the object, it is linked/grouped to several other objects in the model that I do not want to apply the material to. 
 
I have tried to make a copy of the material in the material editor and then reapply to the object, but it still applies it to several other unrelated objects.
 
Also, I seem to be having trouble with my zoom feature in the viewport....my zoom will sometimes work, but sometimes it will zoom all the way to extents of the model, and won't let me zoom back into the interior of the model space; I don't know if this problem is related to the previous issue.