lines missing in print

[Anonymous]

here is the problem, I run a batch program that opens and print the selected drawing, sometimes ONLY sometimes the print will be missing parts of the drawing, like one sheet out of 25 sheets will have this problem.
the program I wrote does the following before the print
command is sent
1. resets the UCS to world
2. ThisDrawing.Application.ZoomExtents
3. ThisDrawing.Application.Update
4. ThisDrawing.Regen (acAllViewports)
any ideas?

[Anonymous]

never mind theres nothing wrong with my code,
I looked in the print group and it sounds like autocad
has the problem with HP printes.

[Anonymous]

Just a thoughts
Perhaps any of lines are on
unplottable layers?
Open layer manager and check it

~'J'~

[Anonymous]

no, all layers are printable,
I can run the program one time and some of the drawings
will be missing some objects then I can run it again and
there will be no missing objects.