In Photoshop, you must select a path, copy it and paste onto another path. Repeat until done. If you cannot do this, try a preference reset:
Win: Press and hold Ctrl+Alt+Shift immediately after initiating Photoshop's startup. A box will appear asking if you want to continue with the reset, select "yes." If you don't see this, you weren't fast enough...Try again.
Mac: Press and hold Cmd+Opt+Shift and start Photoshop. A box will appear, asking if you want to continue with the reset, select "yes."