I am having a problem whereby I cannot place a callout in a particular location next to a 'Pre-defined process' shape to which it refers on a cross functional flow chart. I want to place it above and slightly to the right. When placed there, the Callout jumps to the bottom of the drawing, and the outside of the cross functional flowchart gets a red box around it, and the centre of the diagram gets a red plus sign with a circle in the middle of it. The 'red box' and 'red plus sign' remain visible until I let go of the mouse button.
I can place the Callout in a slightly different position, say above and to the left of the shape, but this is not where I want it.
I can place a different Callout connected to a different shape right in the same position I am trying to get to, and it is OK for that one to sit there.
I have tried replacing both the offending Callout and the shape, but it has not worked
There does not appear to be any background shape that I can see, nor that I can click on, so what else could it be?