Are you opening a drawing? When I get empty dotted boxes in a drawing, it means SW can't find the original model/ assembly to create the drawing from.
this indicates an empty view- not assigned
or/and missing link to file/view as Andrew states
was it a partfile or assy.
are all the parts/files present in the same folder
maybe post a sample file- use packn'go to get all files
have a good'n kelef