Following an issues with the ‘backend’ TVMosaic server. The TV mosaic add-on is not longer available in MyAddons list. Addon working fine untill backend server failed. Issues with server are now resolved, however, can’t load or configure TVMosaic Add-on. Don’t really want to re-install but may have to. …/Steve
Have you checked if its still enabled under addons. If it is try disabling/re-enabling.