I don't know of an easy way to find gaps and overlaps.
You can prevent them by never using 'near' as a running osnap, or its Draftsight equivalent.
I've had the same problem in AutoCAD, thanks to an experienced drafter who checked _every_ running osnap, and then gave up on associative dimensioning, because every dimension was off by .003", and he never figured out why.
Mike,
Thanks for your reply. I will do my best to make sure I snap every connection point or use a cut tool whenever I need to lines to intersect and not try to drop the end of one line on top of another.
BTW, you are just down the street from me. Small World. I am in Weston, FL
John, search for lisp programs. I had one years ago for Acad but I never got it to work in DWGeditor and didn't keep it when changing computers 6 or 7 years ago.