When I Zoom to Extents, my drawing is postage stamp size.

[nmtltd]

Solution:
There is something "out in space" on your drawing. If you are in an Architectural drawing with new doors inserted, it is most likely a point(s) at coordinates 0,0 that was created when CadPLUS drew the door. Turn on all layers and zoom your drawing with a center of 0,0. Erase the points and try Zoom/Extents again.  Here's another way of taking care of it. If you turn on all the layers, then do an erase command and at the first select options prompt enter all, then at the next select options prompt enter remove, and select the things you don't want to erase by window or crossing window, etc, and then hit enter. This will literally erase everything you don't want to remain in your drawing.