Just migrated from SMF2, everything seems intact, but, can't accept new users.
I get this error upon "accepting" a new registration: (everything is default except some of the mods included with default vanilla install I have turned on.)
Duplicate entry '2688-8' for key
'PRIMARY'|Gdn_Database|Query|insert GDN_UserRole (UserID, RoleID)
values (:UserID, :RoleID)