I have started facing the problem
while drawing the path with Pen tool, the tool suddenly becomes inactive and switch to Path Select tool.
After this I am unble to select the Pen tool back or any other tool, it stays on Path Select, and all the tools are inactive at this stage, I am not edit usingany tool ... While all the menus are active I am able to save the file.
So I have to quite and restart PS and then everyting works fine.