Why do I lose mouse scroll control in a worksheet? It makes no difference where I click, the scroll just doesn't work. So far, I have not been able to make this happen in another spreadsheet. Up/Dn arrows work fine. After fishing around for the scroll bars, they work.
The sheet has a list of values that are projected into a chart. When I first open the worksheet and use the mouse wheel, I see the chart jump (refresh?) a very small amount and stop. I wonder if this links to the problem.
The sheet now contains a macro but this was happening before a macro was added.
I have not found any other program or spread sheet where the scroll doesn't work and the system has been rebooted several times for other reasons since this was first observed.