AutoCAD will refuse to load and/or run the macro

I have written a piece of VB that inserts solid objects into an AutoCAD
drawing. These objects match the size and shape of common steel shapes,
such as WF, angle, channel, or tee. The user can chose the length and the
insertion grip point. It seem to work fairly well. The way the VB is
launched is from a menu selection or toolbars that I have also created.
After the VB program has done it's work it unloads itself and terminates.
This leaves nothing loaded and/or running in the VBAIDE editor. From this
description you would think the world would be a wonder place, but not so.
Sometimes, after running the routine several times AutoCAD will refuse to
load and/or run the macro. I can even save the drawing and quit the
session, then re-launch AutoCAD and recall the drawing, but still does not
work. The only solution that I have found is to launch a new session of
AutoCAD, then insert the previous drawing into the new session exploded.
Now for a while it will work. Has any body come across this problem before?

--
Mando Villarreal
ECAD INC
10333 Harwin Dr Suite 655
Houston, TX 77036
P - 713-270-9180
F - 713-270-9125
www.ecadinc.com

 

Any error message ?