Dwg received from 3rd party for editing (2D elec. flr plan).
It appears dwg consists of a single block on layer 0, made up of many other blocks & dwg entities.
When I explode, some of these blocks disappear.
All layers On, Thawed. Zoom extents, yet these entities have vanished.
Could this be an issue with dwg created in an Autodesk vertical product, or perhaps non Autodesk product?
(I’ve been getting dwg.s as these quite often for many years, but I’ve never encountered this issue.)

I found a truncated dwg from same author small enough to upload (which has same issue).
In CAD Blocks "elec_schem"


Edited by Robert_D - 21.Apr.2014 at 18:15

One should always expect to have to deal with proxies when receiving a drawing from an outside source.  That is why I always ask what "flavor" of AutoCAD a drawing was created with so there are no surprises.