Please review following posthttp://help-forums.adobe.com/content/adobeforums/en/experience-manager-forum/adobe-experience-manager.topic.html/forum__sfcl-in_cq5_6_1_toenable.html

What steps you followed for windows? Do you see any error in access.log error.log somewhere on firebug console.Please check following linkshttp://www.wemblog.com/2012/01/how-to-make-http-and-https-version-of.htmlhttp://www.wemblog.com/2011/09/how-to-set-up-ssl-for-local-in-cq.html

There is another user who tried to create group programmatically recently faced same issue. Please review following posthttp://help-forums.adobe.com/content/adobeforums/en/experience-manager-forum/adobe-experience-manager.topic.html/forum__bwkm-i_have_triedcreatin.html

This error usually happens when either the key or value of jcr:uuid is invalidLooking into UserValidator class in source codehttps://apache.googlesource.com/jackrabbit-oak/+/6385a232fe36f580ea23f99c04e24513565ea006/oak-core/src/main/java/org/apache/jackrabbit/oak/security/user/UserValidator.javaLine...

Did you check handler advance checkbox in each step? Checking this box moves workflow to next step.

There is one response on stackoverflow about this question, I find it difficult to enable spell check (often called as Search suggestion in AEM).I am not sure whether following is true, from the link below.http://stackoverflow.com/questions/24710497/enable-spell-checker-in-aem-6-0 Unfortunately, the...

you have to use javax.jcr.Node api to create node and set its property. 

This happened to me quite a few times when there are any  errors in overlaid javascript for siteadmin. There are no errors reported in error.log, but you may see blank screen.I suggest to remove overlaid scripts in /apps area and try again.

Seems to be broken

I believe you have to write overlay for /libs/cq/core/config.author/com.day.cq.commons.servlets.RootMappingServlet This node has a property rootmapping.target which is where it gets landed. you might have to come up with similar class and write a logic in the servlet and peform appropriate action.