Originally Posted by spillage

As I said, the scroll wheel only brings up the Pan icon... with this up, I can only move the view of the page.

Since this issue only exists on one sheet of one workbook, it is very unlikely to be an problem with the mouse... to reinforce this thought, I swapped back to an old mouse, with no change.

I have to say, having to work with/around this multiple cell selection issue is becoming very taxing.