Last edited September 28th, 2011
Connectors do not glue to any shapes when their ends are dragged to the shape's connection point. However, they do glue correctly when using the Properties dialogs and using the Visio Connect Shapes tool.
Gluing Switched Off in File. Gluing behaviour can be set for a file, and may have been switched off.
Check the gluing behaviour (in Visio 2003 and Visio 2007, Tools > Snap & Glue), and modify if necessary.