The alt and left mouse key no longer works within the CLONE function. Get error message – ‘could not use the clone stamp because the area to clone has not been defined (Alt-click to define a source point)’. I have used the clone function previously and know how it works. As previously stated it seems as the ALT-click (left mouse key) have stopped working. The ATL keys works in other non-Adobe/ps applications. Have replaced the mouse. Same results. Running Windows Vista 2007 SP2. Running CS5 12.0.4 x32. Ideas on how to correct this?