Hi, Lyndon,

If, for example, you have a dataset that has user groups XXXX and ZZZZ, and a user 'yy' who belongs to group YYYY, the user belonging to group YYYY will receive the following error message when they try to log into that particular dataset, "Unable to login. Group PRPRT assigned to user yy is not valid." When they respond Okay, the only toolbar buttons that will be available to them are the Open and Exit buttons.

If user yy is gaining access to the data in question, the user group they belong to also exists within that data.