I auto updated both Joomla and K2 and now when a user is trying to update their personal profile on the front page, nothing is saved a 404 Component not found is generated.

Before the update the profile would be updated and the user returned to the front of the K2 Component.

After the update the user is returned to this address: component/users/
which generates a 404 error and nothing is updated

I am only using the Joomla URL rewriting. I read in other posts where people are having similar issues but I can't get mine resolved.