I can't get two "room" objects to "glue" together in a floor plan

I can 't get two rooms to "glue" together in Visio 2010.

I've tried several ways to drag the "room" objects and handles around the floor plan but not only do the rooms not glue to each other, they snap or glue to other things (like ruler divisions), making it almost impossible to get the room walls to overlap cleanly.

I found a forum posting somewhere where the respondent only suggested verifying default settings and I matched mine up with those, but that thread went cold without a solution.

What settings are required, and what steps are required, to glue two "room" objects together in Visio 2010?

Wayne Erfling (aka Cornan The Iowan)