Line tool suddenly not working as it always has

I have been using either the line tool or the pen tool to create property boundary lines for 15 years. Today I went to add some lines to a few images and strange things are happening. Where as I have always just held the control key and clicked the first placement, the second etc till I created all the lines. Now, when I go to click the second line, the the anchor point just moves. If I try to work around by just clicking another area after the first line is created, I have to go to another area, as the first anchor points are still active. If I create all the lines through the workaround (not ideal), the when going to flatten the image, all the lines disapear, and there is no option to bring them to the front. The only way to flatten the image and still have lines is to "set shape layer to stroke"

Also, if I try and use the pen tool, that all goes fine till , once again, when I go to flatten the image, all the anchor points are still there. Not a good look . . .

Does anyone know what changed? I have tried everything I can think of.

Cheers