The commands have a 0.5 to 1 sec pause anyway, but the strange thing is that they work fine as a macro sequence when the button stands alone and is pressed to execute the commands.
However, if the button is linked from elsewhere, from a button that itself has other commands in it, the sequence fails! Bizarre.
My only routes now are to abandon this arrangement which is a pain as it worked on my ProntoPro, or to sit down and decode the xml code and see what happens when a button is linked from elsewhere.