Hello Is your repository served read-write by other services like svnserve or eventually through SSH in addition to Apache HTTPS access ?
If so you have to check your repository file permissions: owner, group and modes (for instance g+w or g+s...) I guess your repository has been created long ago with a previous version of Subversion. What is your repository format version ? Are some revisions packed ? Use svnadmin info. Maybe you should use "svnadmin upgrade" to get some new features properly enabled with Subversion 1.9, or even use dump/load procedure (or svnsync) to get your repository ready (and optimized) for Subversion 1.9. Regards -- Yves Martin