1) you may need to install patch updates or use 5.6.12) check if Scene7 supports CQ5.53) check if successful login helpful ..most probably its a version compatibility/patch issue ..- Venu Gummadala

check for user profiles ..https://dev.day.com/docs/en/cq/current/administering/identity_management.html#Profiles%20and%20User%20Accounts -Venu Gummadala

if you want to get a default page on hitting a URL without file extension(http://example.com:4503/foo instead of http://example.com:4503/foo/index.html) first you must configure the sling:redirect (please refer http://sling.apache.org/documentation/the-sling-engine/mappings-for-resource-resolution.h...

if you want images of varying sizes in real-time you may please use Scene7 .. it is cloud based and you can just include the resolution required in request parameters .. Scene7 delivers it for you. As it is cloud based, it won't impact your local DAM