I can't reproduce it. Try and change this in /install/mssql/procedures.sql
and launch upgrade.
CREATE procedure [{databaseOwner}].[{objectQualifier}group_save](
@GroupID int,
@BoardID int,
@Name nvarchar(50),
@IsAdmin bit,
@IsStart bit,
@IsModerator bit,
@IsGuest bit,
@AccessMaskID int=null,
@PMLimit int=null,
@Style nvarchar(255)=null,
@SortOrder smallint