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ah, thank you, i think i get it now. it seemed that the sys admin -> blocks interface would be setting that ALL -- that if i set the select box to one group, visiblity changes i made were in fact specific for that group. but it sounds more like that user-select box just pulls up a list of blocks based on what you set up in the admin -> groups interface. and the visibility and weight settings you make on any list in that tool are universal.