Funny it seems to have stopped doing it now but the pop up was concerning customising the tool bar as though you right click the mouse. But as i said it seems to have stopped for the moment, I had to select by gently clicking on the extreme left of the mouse. But hey ho lets hope its back to normal again for good.
Many thanks for all your replies

Grumpygrum

Hi all
My wireless mac mouse is giving me the screaming abdabs, but only in sketchup every time that I click on a tool a pop up box opens, I end up clicking about three times before the tool actualy opens it is driving me mad. the mouse is fine in every other app I am using sketch up pro 2015 with Yosemite on my iMac
does anyone else have this problem?

Cheers Gumpgrum