guys,
i think i am having a similar problem. a big site where i located 3 buildings which i modeled separately in their own files. however, when they were brought into the big file i had to place them in new positions relative to their previous origins. then i took them back to the original files and pasted them in the same place as they are in the big file (so that moving them back and forth is easier).
problems: in the original files the first origin is never forgotten when i want to have a facade view. in the big file my renderer (podium) does not "see" the buildings.
any ideas?
EDIT: apparently the problem went away after i closed sketchup and opened it again.