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This patch enables support for CCK multigroups, which at present break cck_fieldgroup_tabs. The issue is that multigroups wrap themselves in a DIV for AHAH callbacks, which cause the tab DIV to be wrapped as well, and then lost when the user triggers multigroup's AHAH functionality, typically by clicking "add another value."
This does actually needs to be a patch to the tabs module, not cck_fieldgroup_tabs, because the relevant code is in the pre_render and theme functions.
I'm not totally comfortable with the CSS used here to format the fieldset properly after the AHAH call, but if you need multigroups and tabs *right now*, as I do, this patch will do it.