Dynamic Pan

Microstation V8i (Select Series 3) V 08.11.09.459

How to do I reset my mouse for the dynamic pan - 'Shift' + Data (Left Mouse).  Somehow this process now does 'Element Select Fence'.

I have already tried to remap mouse Button X1 to Left Button-Right Button Chord but this doesn't change anything.

Thanks in advance because I use this a lot and it's frustrating to be without!