Reset your preferences and see if that fixes issues in your software.
Go to your preferences. Click on "Reset Preferences on Quit" button. Quit Photoshop. Restart Photoshop. Let me know if that fixes your issue.
When panels start to act up like this - which occasionally they can do then :
a. Try resetting the workspace. Go to the top right of the workspace and click on the down arrow. Choose reset from the menu.
If that does not work
b. Reset Preferences. Go to Preferences - General and click on "Reset Preferences on Quit". Click OK then close and restart Photoshop
Looks like Katie was typing at the same time as me, but she obviously types faster . At least we gave the same answer
Thank you, Dave and Katie.
I did have to click on Reset Preferences on Quit and now the contours are back. Now I've got a lot of preferences to reset!