🚀 go-pugleaf

We are having a problem printing information in certain viewports.  Hope
someone can help.
We are using AC2000 with ADT2

Problem:
In certain viewports some entities (apparently at random) will not print
even though their layer is on.  In fact entities with the exact same
properties will print in the same viewport.  The entities are simple 2d
elements (lines, circles, hatches etc... no ADT stuff).  Work arounds
include moving all the entities in model space then moving them back to
their original location or creating a copy of the problem viewports moving
it over and back.  These are standard viewports created with the MVIEW
command there are only 2 or 3 viewports per layout.  Each time we open the
drawing different entities drop out of the print.  The real kicker is I can
open the problem files on one machine and print per usual.

I have checked:
Layers are on/thawed and are set to print.
Color is by layer.
The CTB file is set to print each color.
Viewport is turned on (interesting note if I turn off a problem viewport
then turn it back on nothing displays, even after a regen)
there are no overlapping viewports
entities in model space are not more than 500 units from 0,0
hideplot set to NO
SHADEMODE = 2dwireframe
copy of exact viewport will sometimes print sometimes not.
other viewports in the same layout print properly
print preview does not display correctly (entities are missing but not
always the same entities that do not print)
wblocking model space and starting over in paperspace sometimes works but
eventually the problem comes back.

Any suggestions because im about out of ideas.
thanks - kd