"Further update, installed WizMouse which seems to work really well. I can now cntrl-zoom and also scroll any pane that the mouse is hover..."

"Ah, mystery solved I think. It appears to be a little utility called Katmouse which I use to overcome window's inability to scroll multip..."

"I don't have an alternative currently but I notice there's something else going on with whole zoom feature. When I try to use Cntl-mouse ..."

"Thanks Alexandros - I thought this might be the case but hoped otherwise."

"Perhaps, although it works perfectly well with all my other software. I wonder if it's because it's a Wacom mouse that came with my Intuo..."