I think we have indentified the issue here - are you creating the space first and then selecting it using the space picker widget? i.e. you are not entering the name of a space in the "Home Space Name" field but just selecting an existing space in the "Home Space Location" field? If so that bug has been raised and I will look at it today.
I have fixed this and the other Home Space creation/setting bugs you/others have mentioned. The code will be available in the next nightly build and the next offical release.
FYI… if you want to patch an existing build (including Enterprise) from the next nightly build source, then you only need to patch in the following class to get these fixes: org.alfresco.web.bean.wizard.NewUserWizard
Archive: Alfresco Content Services / ECM
Archive content from 2016 and relating to earlier versions of Alfresco Content Services, Community and Alfresco One.