BuddyPress.org

I use BP since 0.9 beta…so it’s an updated, updated,updated site…

Did you allow blog creation to your members ? Because in the “undefined function”, enabled is set to 1 (yes)

Check also the plugin admin ( who is administrator, members, authors, etc)

Maybe you have a conflict with a plugin ?

Deactivate all your plugins except BP

Reactivate first (site wide) bp-groupblog and view if the error occurs.

If nothing happens, reactivate the other plugins one by one until you find the bad boy.

Also don’t forget to update all the (members) blogs after a core update. (i forget this always)