SharePoint/Access CurrentWebUserGroups() 128 character limit

From a SharePoint webDB when asking for CurrentWebUserGroups() or IsCurrentWebUserInGroup() what is returned seems to be limited to 128 characters, so it is not returning all of the groups that my user is in.

Is there some way to get around this?  Maybe list all members of a specific group to test for a match (assuming it wouldn't stop after 128 characters as well)?

Thanks