Hi, Anne-Marie Michaelis
Have you tried re-saving the permalinks under wp-admin > settings > permalinks? Also, please make sure that user is logged in when viewing the link.
If its still not working, kindly send me your website url so that I can check what is happening.
When trying to connect to the My Photos or My Videos pages from the left side menu I receive the 404 error and page cannot be found. Please help!