Using Visio 2003. I am trying to connect to shapes (servers) together with a connector. When I drag the end of the connector over a shape or to a connection on the shape (server), the connection does not turn red. It "snaps to" the connection point, but it will not glue. If I drag the shape the connection between the shape and the connector is broken. What I expect is the connection point to turn red when I connect the connector to the shape and then when I drag the shape the connector remains attached to the shape.
What setting is preventing the behavior I expect?