When using tools such as the various lasso tools, I get three cursors in a horizontal line, the leftmost one being the active one. Then when I click in a panel, it turns into a hieroglyph resembling three small vehicles or boats in a line. I don't know if this is related to the reputed bug that plagues gamers using Win 8.1. Any suggestions greatly appreciated.
I seem to have solved my problem and give the solution for the benefit of anyone else encountering it.
I had right clicked on the Desktop and selected Screen Resolution. I then clicked on 'Make text and other items larger or smaller' and moved the slider to the right to make the PS panels larger.
This seems to have caused the problem, and I overcame it by returning the slider to the central position and then reducing the screen resolution to bring the panels up to the desired size.