what registration system?  If you are using joomla, they get created in SMF the first time they login.  If you don't like this method then you need to use CB or SMF registration which create the user upon registration.

are you using CB registration then?  The selection only means all registration links are changed to point to that registration system, in this case CB.  If you are using CB registration then you need to make sure you have the CB plugin installed.  And you should upgrade to JSMF 2.0RC3

I upgraded to the latest version of CB today, thinking it might help, but still no luck. When registering new users the user is not created in SMF.

I am using CB 1.0.2, Joomla 1.0.11 Stable, SMF 1.1 RC3 and JSMF 2.0 RC3

I have register users set to yes in joomla global config, but new users are registered through CB. I am using the CB login also.

I tried reinstalling JSMF when I upgraded CB, but no change. Has any one else encountered this problem? Or can anybody offer any assistance?
To have a play , try creating a new user for yourself (site still in BETA), user validation is automatic so you can input any email address (even fake) and you will be registered. Hopefully we can work out where I am going wrong

Many thanks